399023907 has 4 divisors (see below), whose sum is σ = 532031880. Its totient is φ = 266015936.

The previous prime is 399023899. The next prime is 399023929. The reversal of 399023907 is 709320993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399023907 - 2³ = 399023899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399023407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66503982 + ... + 66503987.

It is an arithmetic number, because the mean of its divisors is an integer number (133007970).

Almost surely, 2^399023907 is an apocalyptic number.

399023907 is a deficient number, since it is larger than the sum of its proper divisors (133007973).

399023907 is a wasteful number, since it uses less digits than its factorization.

399023907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133007972.

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 399023907 is about 19975.5827699719. The cubic root of 399023907 is about 736.2064853414.

The spelling of 399023907 in words is "three hundred ninety-nine million, twenty-three thousand, nine hundred seven".