400115155 has 16 divisors (see below), whose sum is σ = 524218464. Its totient is φ = 290753280.

The previous prime is 400115141. The next prime is 400115197. The reversal of 400115155 is 551511004.

It is a happy number.

It is not a de Polignac number, because 400115155 - 2⁵ = 400115123 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 90967 + ... + 95263.

It is an arithmetic number, because the mean of its divisors is an integer number (32763654).

Almost surely, 2^400115155 is an apocalyptic number.

400115155 is a deficient number, since it is larger than the sum of its proper divisors (124103309).

400115155 is a wasteful number, since it uses less digits than its factorization.

400115155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 400115155 is about 20002.8786678318. The cubic root of 400115155 is about 736.8769987186.

Adding to 400115155 its reverse (551511004), we get a palindrome (951626159).

The spelling of 400115155 in words is "four hundred million, one hundred fifteen thousand, one hundred fifty-five".