1620392725 has 12 divisors (see below), whose sum is σ = 2296328224. Its totient is φ = 1111126320.

The previous prime is 1620392677. The next prime is 1620392729. The reversal of 1620392725 is 5272930261.

It is not a de Polignac number, because 1620392725 - 2⁷ = 1620392597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620392729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4629519 + ... + 4629868.

Almost surely, 2^1620392725 is an apocalyptic number.

It is an amenable number.

1620392725 is a deficient number, since it is larger than the sum of its proper divisors (675935499).

1620392725 is an equidigital number, since it uses as much as digits as its factorization.

1620392725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9259404 (or 9259399 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1620392725 is about 40254.1019648930. The cubic root of 1620392725 is about 1174.5551900156. Note that the first 3 decimals are identical.

The spelling of 1620392725 in words is "one billion, six hundred twenty million, three hundred ninety-two thousand, seven hundred twenty-five".