40404155 has 32 divisors (see below), whose sum is σ = 56816640. Its totient is φ = 27256320.

The previous prime is 40404139. The next prime is 40404157. The reversal of 40404155 is 55140404.

It is not a de Polignac number, because 40404155 - 2⁴ = 40404139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40404155.

It is not an unprimeable number, because it can be changed into a prime (40404157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73592 + ... + 74138.

It is an arithmetic number, because the mean of its divisors is an integer number (1775520).

Almost surely, 2^40404155 is an apocalyptic number.

40404155 is a deficient number, since it is larger than the sum of its proper divisors (16412485).

40404155 is a wasteful number, since it uses less digits than its factorization.

40404155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 40404155 is about 6356.4262758251. The cubic root of 40404155 is about 343.1431572127.

Adding to 40404155 its reverse (55140404), we get a palindrome (95544559).

The spelling of 40404155 in words is "forty million, four hundred four thousand, one hundred fifty-five".