399676967 has 4 divisors (see below), whose sum is σ = 399822360. Its totient is φ = 399531576.

The previous prime is 399676933. The next prime is 399677011. The reversal of 399676967 is 769676993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769676993 = 661 ⋅1164413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399676967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399676567) 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, 68492 + ... + 74097.

It is an arithmetic number, because the mean of its divisors is an integer number (99955590).

Almost surely, 2^399676967 is an apocalyptic number.

399676967 is a deficient number, since it is larger than the sum of its proper divisors (145393).

399676967 is a wasteful number, since it uses less digits than its factorization.

399676967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145392.

The product of its digits is 23147208, while the sum is 62.

The square root of 399676967 is about 19991.9225438676. The cubic root of 399676967 is about 736.6079023532.

The spelling of 399676967 in words is "three hundred ninety-nine million, six hundred seventy-six thousand, nine hundred sixty-seven".