40869939 has 32 divisors (see below), whose sum is σ = 61424640. Its totient is φ = 23961600.

The previous prime is 40869923. The next prime is 40869971. The reversal of 40869939 is 93996804.

It is a happy number.

40869939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40869939 - 2⁴ = 40869923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40869979) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 158899 + ... + 159155.

It is an arithmetic number, because the mean of its divisors is an integer number (1919520).

Almost surely, 2^40869939 is an apocalyptic number.

40869939 is a deficient number, since it is larger than the sum of its proper divisors (20554701).

40869939 is a wasteful number, since it uses less digits than its factorization.

40869939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 40869939 is about 6392.9601124987. The cubic root of 40869939 is about 344.4567210755.

The spelling of 40869939 in words is "forty million, eight hundred sixty-nine thousand, nine hundred thirty-nine".