399780625 has 20 divisors (see below), whose sum is σ = 507075184. Its totient is φ = 315018000.

The previous prime is 399780611. The next prime is 399780629. The reversal of 399780625 is 526087993.

It is not a de Polignac number, because 399780625 - 2⁵ = 399780593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399780629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37102 + ... + 46648.

Almost surely, 2^399780625 is an apocalyptic number.

It is an amenable number.

399780625 is a deficient number, since it is larger than the sum of its proper divisors (107294559).

399780625 is an frugal number, since it uses more digits than its factorization.

399780625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9634 (or 9619 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 399780625 is about 19994.5148728345. The cubic root of 399780625 is about 736.6715776945.

The spelling of 399780625 in words is "three hundred ninety-nine million, seven hundred eighty thousand, six hundred twenty-five".