399415638 has 8 divisors (see below), whose sum is σ = 798831288. Its totient is φ = 133138544.

The previous prime is 399415607. The next prime is 399415651. The reversal of 399415638 is 836514993.

It is a sphenic number, since it is the product of 3 distinct primes.

399415638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33284631 + ... + 33284642.

It is an arithmetic number, because the mean of its divisors is an integer number (99853911).

Almost surely, 2^399415638 is an apocalyptic number.

399415638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399415638 is a wasteful number, since it uses less digits than its factorization.

399415638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66569278.

The product of its digits is 699840, while the sum is 48.

The square root of 399415638 is about 19985.3856104905. The cubic root of 399415638 is about 736.4473235255.

The spelling of 399415638 in words is "three hundred ninety-nine million, four hundred fifteen thousand, six hundred thirty-eight".