1620957252 has 24 divisors (see below), whose sum is σ = 3782955232. Its totient is φ = 540216000.

The previous prime is 1620957251. The next prime is 1620957281. The reversal of 1620957252 is 2527590261.

It is a super-2 number, since 2×1620957252² = 5255004825622783008, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1620957252.

It is not an unprimeable number, because it can be changed into a prime (1620957251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78627 + ... + 97077.

Almost surely, 2^1620957252 is an apocalyptic number.

1620957252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620957252 is an abundant number, since it is smaller than the sum of its proper divisors (2161997980).

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

1620957252 is a wasteful number, since it uses less digits than its factorization.

1620957252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25779 (or 25777 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 1620957252 is about 40261.1133974211. The cubic root of 1620957252 is about 1174.6915748809.

The spelling of 1620957252 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, two hundred fifty-two".