399784374 has 24 divisors (see below), whose sum is σ = 944945352. Its totient is φ = 121146720.

The previous prime is 399784337. The next prime is 399784387. The reversal of 399784374 is 473487993.

It is a self number, because there is not a number n which added to its sum of digits gives 399784374.

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 11 ways as a sum of consecutive naturals, for example, 1009359 + ... + 1009754.

It is an arithmetic number, because the mean of its divisors is an integer number (39372723).

Almost surely, 2^399784374 is an apocalyptic number.

399784374 is an abundant number, since it is smaller than the sum of its proper divisors (545160978).

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

399784374 is a wasteful number, since it uses less digits than its factorization.

399784374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019132 (or 2019129 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 399784374 is about 19994.6086233264. The cubic root of 399784374 is about 736.6738804350.

The spelling of 399784374 in words is "three hundred ninety-nine million, seven hundred eighty-four thousand, three hundred seventy-four".