1620120 has 64 divisors (see below), whose sum is σ = 5080320. Its totient is φ = 412544.

The previous prime is 1620107. The next prime is 1620121. The reversal of 1620120 is 210261.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1620096 and 1620105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2467 + ... + 3053.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1620120 is an apocalyptic number.

1620120 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 1620120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2540160).

1620120 is an abundant number, since it is smaller than the sum of its proper divisors (3460200).

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

1620120 is a wasteful number, since it uses less digits than its factorization.

1620120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1620120 is about 1272.8393457149. The cubic root of 1620120 is about 117.4489290654.

Adding to 1620120 its reverse (210261), we get a palindrome (1830381).

The spelling of 1620120 in words is "one million, six hundred twenty thousand, one hundred twenty".