399258279 has 24 divisors (see below), whose sum is σ = 673121280. Its totient is φ = 223291728.

The previous prime is 399258259. The next prime is 399258367. The reversal of 399258279 is 972852993.

It is not a de Polignac number, because 399258279 - 2²³ = 390869671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399258239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64459 + ... + 70380.

It is an arithmetic number, because the mean of its divisors is an integer number (28046720).

Almost surely, 2^399258279 is an apocalyptic number.

399258279 is a deficient number, since it is larger than the sum of its proper divisors (273863001).

399258279 is a wasteful number, since it uses less digits than its factorization.

399258279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134899 (or 134896 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 399258279 is about 19981.4483709265. The cubic root of 399258279 is about 736.3505973540.

The spelling of 399258279 in words is "three hundred ninety-nine million, two hundred fifty-eight thousand, two hundred seventy-nine".