39145979 has 2 divisors, whose sum is σ = 39145980. Its totient is φ = 39145978.

The previous prime is 39145973. The next prime is 39145987. The reversal of 39145979 is 97954193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39145979 - 2⁸ = 39145723 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 (39145973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19572989 + 19572990.

It is an arithmetic number, because the mean of its divisors is an integer number (19572990).

Almost surely, 2^39145979 is an apocalyptic number.

39145979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39145979 is an equidigital number, since it uses as much as digits as its factorization.

39145979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 39145979 is about 6256.6747558108. The cubic root of 39145979 is about 339.5437334262.

The spelling of 39145979 in words is "thirty-nine million, one hundred forty-five thousand, nine hundred seventy-nine".