39859979 has 2 divisors, whose sum is σ = 39859980. Its totient is φ = 39859978.

The previous prime is 39859973. The next prime is 39859993. The reversal of 39859979 is 97995893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39859979 - 2⁸ = 39859723 is a prime.

It is not a weakly prime, because it can be changed into another prime (39859973) 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, 19929989 + 19929990.

It is an arithmetic number, because the mean of its divisors is an integer number (19929990).

Almost surely, 2^39859979 is an apocalyptic number.

39859979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39859979 is an equidigital number, since it uses as much as digits as its factorization.

39859979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 59.

The square root of 39859979 is about 6313.4759839569. The cubic root of 39859979 is about 341.5956685579.

The spelling of 39859979 in words is "thirty-nine million, eight hundred fifty-nine thousand, nine hundred seventy-nine".