1620000 has 150 divisors (see below), whose sum is σ = 5953563. Its totient is φ = 432000.

The previous prime is 1619987. The next prime is 1620001. The reversal of 1620000 is 261.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 374544 + 1245456 = 612^2 + 1116^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=900.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 6 and base 15.

It is a zygodrome in base 15.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 150 × 90 × 120.

It is not an unprimeable number, because it can be changed into a prime (1620001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 323998 + ... + 324002.

2^1620000 is an apocalyptic number.

1620000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620000

1620000 is an abundant number, since it is smaller than the sum of its proper divisors (4333563).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620000 is an frugal number, since it uses more digits than its factorization.

1620000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1620000 is about 1272.7922061358. The cubic root of 1620000 is about 117.4460292351.

Adding to 1620000 its reverse (261), we get a palindrome (1620261).

The spelling of 1620000 in words is "one million, six hundred twenty thousand".