40518979 has 2 divisors, whose sum is σ = 40518980. Its totient is φ = 40518978.

The previous prime is 40518971. The next prime is 40518997. The reversal of 40518979 is 97981504.

Together with next prime (40518997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40518979 - 2³ = 40518971 is a prime.

It is not a weakly prime, because it can be changed into another prime (40518971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20259489 + 20259490.

It is an arithmetic number, because the mean of its divisors is an integer number (20259490).

Almost surely, 2^40518979 is an apocalyptic number.

40518979 is a deficient number, since it is larger than the sum of its proper divisors (1).

40518979 is an equidigital number, since it uses as much as digits as its factorization.

40518979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 40518979 is about 6365.4519870941. The cubic root of 40518979 is about 343.4679076767.

The spelling of 40518979 in words is "forty million, five hundred eighteen thousand, nine hundred seventy-nine".