399125961 has 40 divisors (see below), whose sum is σ = 662855424. Its totient is φ = 237673440.

The previous prime is 399125959. The next prime is 399125999. The reversal of 399125961 is 169521993.

It is a happy number.

399125961 is a `hidden beast` number, since 399 + 1 + 259 + 6 + 1 = 666.

It is not a de Polignac number, because 399125961 - 2¹ = 399125959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399125911) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26530 + ... + 38756.

Almost surely, 2^399125961 is an apocalyptic number.

399125961 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

399125961 is a deficient number, since it is larger than the sum of its proper divisors (263729463).

399125961 is a wasteful number, since it uses less digits than its factorization.

399125961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12283 (or 12274 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 399125961 is about 19978.1370753131. The cubic root of 399125961 is about 736.2692438303.

The spelling of 399125961 in words is "three hundred ninety-nine million, one hundred twenty-five thousand, nine hundred sixty-one".