1620018 has 12 divisors (see below), whose sum is σ = 3510078. Its totient is φ = 540000.

The previous prime is 1620013. The next prime is 1620019. The reversal of 1620018 is 8100261.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 804609 = 903^2 + 897^2 .

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 90001 = 1620018 / (1 + 6 + 2 + 0 + 0 + 1 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44983 + ... + 45018.

2^1620018 is an apocalyptic number.

1620018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1620018 is an abundant number, since it is smaller than the sum of its proper divisors (1890060).

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

1620018 is a wasteful number, since it uses less digits than its factorization.

1620018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90009 (or 90006 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1620018 is about 1272.7992771840. The cubic root of 1620018 is about 117.4464642187.

Adding to 1620018 its reverse (8100261), we get a palindrome (9720279).

It can be divided in two parts, 16200 and 18, that multiplied together give a square (291600 = 540²).

The spelling of 1620018 in words is "one million, six hundred twenty thousand, eighteen".