399213834 has 16 divisors (see below), whose sum is σ = 803210688. Its totient is φ = 132274112.

The previous prime is 399213821. The next prime is 399213851. The reversal of 399213834 is 438312993.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198207 + ... + 200210.

It is an arithmetic number, because the mean of its divisors is an integer number (50200668).

Almost surely, 2^399213834 is an apocalyptic number.

399213834 is an abundant number, since it is smaller than the sum of its proper divisors (403996854).

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

399213834 is a wasteful number, since it uses less digits than its factorization.

399213834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398589.

The product of its digits is 139968, while the sum is 42.

The square root of 399213834 is about 19980.3361833579. The cubic root of 399213834 is about 736.3232730893.

The spelling of 399213834 in words is "three hundred ninety-nine million, two hundred thirteen thousand, eight hundred thirty-four".