400039839 has 6 divisors (see below), whose sum is σ = 577835336. Its totient is φ = 266693220.

The previous prime is 400039811. The next prime is 400039847. The reversal of 400039839 is 938930004.

It is not a de Polignac number, because 400039839 - 2⁵ = 400039807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400039439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22224427 + ... + 22224444.

Almost surely, 2^400039839 is an apocalyptic number.

400039839 is a deficient number, since it is larger than the sum of its proper divisors (177795497).

400039839 is a wasteful number, since it uses less digits than its factorization.

400039839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44448877 (or 44448874 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 400039839 is about 20000.9959502021. The cubic root of 400039839 is about 736.8307602712.

The spelling of 400039839 in words is "four hundred million, thirty-nine thousand, eight hundred thirty-nine".