40909979 has 12 divisors (see below), whose sum is σ = 45122112. Its totient is φ = 37062960.

The previous prime is 40909969. The next prime is 40909997. The reversal of 40909979 is 97990904.

40909979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-40909979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40909909) 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 11 ways as a sum of consecutive naturals, for example, 67094 + ... + 67700.

It is an arithmetic number, because the mean of its divisors is an integer number (3760176).

Almost surely, 2^40909979 is an apocalyptic number.

40909979 is a deficient number, since it is larger than the sum of its proper divisors (4212133).

40909979 is a wasteful number, since it uses less digits than its factorization.

40909979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 40909979 is about 6396.0909155515. The cubic root of 40909979 is about 344.5691716599.

It can be divided in two parts, 40 and 909979, that added together give a palindrome (910019).

The spelling of 40909979 in words is "forty million, nine hundred nine thousand, nine hundred seventy-nine".