40505979 has 4 divisors (see below), whose sum is σ = 54007976. Its totient is φ = 27003984.

The previous prime is 40505911. The next prime is 40505981. The reversal of 40505979 is 97950504.

40505979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40505979 - 2⁸ = 40505723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40545979) 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 3 ways as a sum of consecutive naturals, for example, 6750994 + ... + 6750999.

It is an arithmetic number, because the mean of its divisors is an integer number (13501994).

Almost surely, 2^40505979 is an apocalyptic number.

40505979 is a deficient number, since it is larger than the sum of its proper divisors (13501997).

40505979 is a wasteful number, since it uses less digits than its factorization.

40505979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501996.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 40505979 is about 6364.4307679478. The cubic root of 40505979 is about 343.4311713084.

The spelling of 40505979 in words is "forty million, five hundred five thousand, nine hundred seventy-nine".