399106625 has 16 divisors (see below), whose sum is σ = 498672720. Its totient is φ = 318908800.

The previous prime is 399106577. The next prime is 399106627. The reversal of 399106625 is 526601993.

It can be written as a sum of positive squares in 8 ways, for example, as 71351809 + 327754816 = 8447^2 + 18104^2 .

It is not a de Polignac number, because 399106625 - 2²⁰ = 398058049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399106627) 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, 159887 + ... + 162363.

It is an arithmetic number, because the mean of its divisors is an integer number (31167045).

Almost surely, 2^399106625 is an apocalyptic number.

It is an amenable number.

399106625 is a deficient number, since it is larger than the sum of its proper divisors (99566095).

399106625 is a wasteful number, since it uses less digits than its factorization.

399106625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781 (or 3771 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 399106625 is about 19977.6531404467. The cubic root of 399106625 is about 736.2573539063.

The spelling of 399106625 in words is "three hundred ninety-nine million, one hundred six thousand, six hundred twenty-five".