399779974 has 64 divisors (see below), whose sum is σ = 705853440. Its totient is φ = 168030720.

The previous prime is 399779953. The next prime is 399779981. The reversal of 399779974 is 479977993.

399779974 = T₂₃₄₇ + T₂₃₄₈ + ... + T₂₄₈₃.

It is a happy number.

It is a super-3 number, since 3×399779974³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2918034 + ... + 2918170.

It is an arithmetic number, because the mean of its divisors is an integer number (11028960).

Almost surely, 2^399779974 is an apocalyptic number.

399779974 is a deficient number, since it is larger than the sum of its proper divisors (306073466).

399779974 is a wasteful number, since it uses less digits than its factorization.

399779974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its digits is 27005076, while the sum is 64.

The square root of 399779974 is about 19994.4985933631. The cubic root of 399779974 is about 736.6711778307.

The spelling of 399779974 in words is "three hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred seventy-four".