40807979 has 2 divisors, whose sum is σ = 40807980. Its totient is φ = 40807978.

The previous prime is 40807969. The next prime is 40808063. The reversal of 40807979 is 97970804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40807979 - 2¹² = 40803883 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40807969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20403989 + 20403990.

It is an arithmetic number, because the mean of its divisors is an integer number (20403990).

Almost surely, 2^40807979 is an apocalyptic number.

40807979 is a deficient number, since it is larger than the sum of its proper divisors (1).

40807979 is an equidigital number, since it uses as much as digits as its factorization.

40807979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 40807979 is about 6388.1123189875. The cubic root of 40807979 is about 344.2825642800.

The spelling of 40807979 in words is "forty million, eight hundred seven thousand, nine hundred seventy-nine".