40155945 has 16 divisors (see below), whose sum is σ = 64437120. Its totient is φ = 21353984.

The previous prime is 40155917. The next prime is 40155959. The reversal of 40155945 is 54955104.

40155945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 40155945 - 2⁹ = 40155433 is a prime.

It is a super-2 number, since 2×40155945² = 3224999837686050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1657 + ... + 9113.

It is an arithmetic number, because the mean of its divisors is an integer number (4027320).

Almost surely, 2^40155945 is an apocalyptic number.

It is an amenable number.

40155945 is a deficient number, since it is larger than the sum of its proper divisors (24281175).

40155945 is a wasteful number, since it uses less digits than its factorization.

40155945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7824.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 40155945 is about 6336.8718623624. The cubic root of 40155945 is about 342.4390500170.

The spelling of 40155945 in words is "forty million, one hundred fifty-five thousand, nine hundred forty-five".