399707039 has 4 divisors (see below), whose sum is σ = 399949056. Its totient is φ = 399465024.

The previous prime is 399707017. The next prime is 399707089. The reversal of 399707039 is 930707993.

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 399707039 - 2²⁸ = 131271583 is a prime.

It is a super-2 number, since 2×399707039² = 319531434052295042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399706984 and 399707002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399707089) 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, 118514 + ... + 121839.

It is an arithmetic number, because the mean of its divisors is an integer number (99987264).

Almost surely, 2^399707039 is an apocalyptic number.

399707039 is a deficient number, since it is larger than the sum of its proper divisors (242017).

399707039 is a wasteful number, since it uses less digits than its factorization.

399707039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242016.

The product of its (nonzero) digits is 321489, while the sum is 47.

The square root of 399707039 is about 19992.6746334751. The cubic root of 399707039 is about 736.6263762035.

The spelling of 399707039 in words is "three hundred ninety-nine million, seven hundred seven thousand, thirty-nine".