399000625 has 45 divisors (see below), whose sum is σ = 541154119. Its totient is φ = 294032000.

The previous prime is 399000583. The next prime is 399000649. The reversal of 399000625 is 526000993.

It is a happy number.

The square root of 399000625 is 19975.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 194853681 + 204146944 = 13959^2 + 14288^2 .

It is a de Polignac number, because none of the positive numbers 2^k-399000625 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8489352 + ... + 8489398.

Almost surely, 2^399000625 is an apocalyptic number.

399000625 is the 19975-th square number.

399000625 is the 9988-th centered octagonal number.

It is an amenable number.

399000625 is a deficient number, since it is larger than the sum of its proper divisors (142153494).

399000625 is an frugal number, since it uses more digits than its factorization.

399000625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 34.

The cubic root of 399000625 is about 736.1921664894.

The spelling of 399000625 in words is "three hundred ninety-nine million, six hundred twenty-five", and thus it is an aban number.