400515115 has 64 divisors (see below), whose sum is σ = 660667392. Its totient is φ = 224985600.

The previous prime is 400515109. The next prime is 400515139. The reversal of 400515115 is 511515004.

It is a happy number.

It is not a de Polignac number, because 400515115 - 2³ = 400515107 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 63 ways as a sum of consecutive naturals, for example, 214285 + ... + 216145.

It is an arithmetic number, because the mean of its divisors is an integer number (10322928).

Almost surely, 2^400515115 is an apocalyptic number.

400515115 is a deficient number, since it is larger than the sum of its proper divisors (260152277).

400515115 is a wasteful number, since it uses less digits than its factorization.

400515115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940.

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

The square root of 400515115 is about 20012.8737316758. The cubic root of 400515115 is about 737.1224473708.

It can be divided in two parts, 400 and 515115, that added together give a palindrome (515515).

The spelling of 400515115 in words is "four hundred million, five hundred fifteen thousand, one hundred fifteen".