40405155 has 24 divisors (see below), whose sum is σ = 75204432. Its totient is φ = 18470592.

The previous prime is 40405139. The next prime is 40405163. The reversal of 40405155 is 55150404.

It is not a de Polignac number, because 40405155 - 2⁴ = 40405139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26752 + ... + 28221.

It is an arithmetic number, because the mean of its divisors is an integer number (3133518).

Almost surely, 2^40405155 is an apocalyptic number.

40405155 is a deficient number, since it is larger than the sum of its proper divisors (34799277).

40405155 is a wasteful number, since it uses less digits than its factorization.

40405155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54995 (or 54988 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 40405155 is about 6356.5049358905. The cubic root of 40405155 is about 343.1459881124.

Adding to 40405155 its reverse (55150404), we get a palindrome (95555559).

The spelling of 40405155 in words is "forty million, four hundred five thousand, one hundred fifty-five".