399926864 has 20 divisors (see below), whose sum is σ = 776914560. Its totient is φ = 199432800.

The previous prime is 399926861. The next prime is 399926867. The reversal of 399926864 is 468629993.

It is an interprime number because it is at equal distance from previous prime (399926861) and next prime (399926867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399926861) 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, 26912 + ... + 39039.

It is an arithmetic number, because the mean of its divisors is an integer number (38845728).

Almost surely, 2^399926864 is an apocalyptic number.

It is an amenable number.

399926864 is a deficient number, since it is larger than the sum of its proper divisors (376987696).

399926864 is a wasteful number, since it uses less digits than its factorization.

399926864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66338 (or 66332 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 56.

The square root of 399926864 is about 19998.1715164162. The cubic root of 399926864 is about 736.7613911030.

The spelling of 399926864 in words is "three hundred ninety-nine million, nine hundred twenty-six thousand, eight hundred sixty-four".