399951438 has 16 divisors (see below), whose sum is σ = 801636096. Its totient is φ = 133028280.

The previous prime is 399951437. The next prime is 399951457. The reversal of 399951438 is 834159993.

It is a happy number.

It is a super-2 number, since 2×399951438² = 319922305516535688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399951437) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 69208 + ... + 74763.

It is an arithmetic number, because the mean of its divisors is an integer number (50102256).

Almost surely, 2^399951438 is an apocalyptic number.

399951438 is an abundant number, since it is smaller than the sum of its proper divisors (401684658).

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

399951438 is a wasteful number, since it uses less digits than its factorization.

399951438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144439.

The product of its digits is 1049760, while the sum is 51.

The square root of 399951438 is about 19998.7859131498. The cubic root of 399951438 is about 736.7764811984.

The spelling of 399951438 in words is "three hundred ninety-nine million, nine hundred fifty-one thousand, four hundred thirty-eight".