40339979 has 2 divisors, whose sum is σ = 40339980. Its totient is φ = 40339978.

The previous prime is 40339961. The next prime is 40339987. The reversal of 40339979 is 97993304.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40339979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40339939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20169989 + 20169990.

It is an arithmetic number, because the mean of its divisors is an integer number (20169990).

Almost surely, 2^40339979 is an apocalyptic number.

40339979 is a deficient number, since it is larger than the sum of its proper divisors (1).

40339979 is an equidigital number, since it uses as much as digits as its factorization.

40339979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 40339979 is about 6351.3761500953. The cubic root of 40339979 is about 342.9613836230.

The spelling of 40339979 in words is "forty million, three hundred thirty-nine thousand, nine hundred seventy-nine".