399722707 has 4 divisors (see below), whose sum is σ = 399764160. Its totient is φ = 399681256.

The previous prime is 399722693. The next prime is 399722723. The reversal of 399722707 is 707227993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 707227993 = 433 ⋅1633321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399722707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399723707) 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, 2169 + ... + 28357.

It is an arithmetic number, because the mean of its divisors is an integer number (99941040).

Almost surely, 2^399722707 is an apocalyptic number.

399722707 is a deficient number, since it is larger than the sum of its proper divisors (41453).

399722707 is a wasteful number, since it uses less digits than its factorization.

399722707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41452.

The product of its (nonzero) digits is 333396, while the sum is 46.

The square root of 399722707 is about 19993.0664731551. The cubic root of 399722707 is about 736.6360010121.

The spelling of 399722707 in words is "three hundred ninety-nine million, seven hundred twenty-two thousand, seven hundred seven".