399846638 has 8 divisors (see below), whose sum is σ = 601337088. Its totient is φ = 199400944.

The previous prime is 399846619. The next prime is 399846691. The reversal of 399846638 is 836648993.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260231 + ... + 261762.

It is an arithmetic number, because the mean of its divisors is an integer number (75167136).

Almost surely, 2^399846638 is an apocalyptic number.

399846638 is a deficient number, since it is larger than the sum of its proper divisors (201490450).

399846638 is a wasteful number, since it uses less digits than its factorization.

399846638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522378.

The product of its digits is 6718464, while the sum is 56.

The square root of 399846638 is about 19996.1655824310. The cubic root of 399846638 is about 736.7121226179.

The spelling of 399846638 in words is "three hundred ninety-nine million, eight hundred forty-six thousand, six hundred thirty-eight".