400164139 has 12 divisors (see below), whose sum is σ = 436588384. Its totient is φ = 366436224.

The previous prime is 400164119. The next prime is 400164199. The reversal of 400164139 is 931461004.

It is not a de Polignac number, because 400164139 - 2¹⁵ = 400131371 is a prime.

It is a super-2 number, since 2×400164139² = 320262676283222642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400164119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8019 + ... + 29404.

Almost surely, 2^400164139 is an apocalyptic number.

400164139 is the 10693-rd nonagonal number.

400164139 is a deficient number, since it is larger than the sum of its proper divisors (36424245).

400164139 is a wasteful number, since it uses less digits than its factorization.

400164139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37494 (or 37477 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 400164139 is about 20004.1030541237. The cubic root of 400164139 is about 736.9070681537.

The spelling of 400164139 in words is "four hundred million, one hundred sixty-four thousand, one hundred thirty-nine".