399155097 has 32 divisors (see below), whose sum is σ = 617541120. Its totient is φ = 226782720.

The previous prime is 399155093. The next prime is 399155123. The reversal of 399155097 is 790551993.

It is not a de Polignac number, because 399155097 - 2² = 399155093 is a prime.

It is a super-2 number, since 2×399155097² = 318649582922158818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399155093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57538 + ... + 64100.

It is an arithmetic number, because the mean of its divisors is an integer number (19298160).

Almost surely, 2^399155097 is an apocalyptic number.

It is an amenable number.

399155097 is a deficient number, since it is larger than the sum of its proper divisors (218386023).

399155097 is a wasteful number, since it uses less digits than its factorization.

399155097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6693.

The product of its (nonzero) digits is 382725, while the sum is 48.

The square root of 399155097 is about 19978.8662591249. The cubic root of 399155097 is about 736.2871591593.

The spelling of 399155097 in words is "three hundred ninety-nine million, one hundred fifty-five thousand, ninety-seven".