39981079 has 4 divisors (see below), whose sum is σ = 40033840. Its totient is φ = 39928320.

The previous prime is 39981049. The next prime is 39981083. The reversal of 39981079 is 97018993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97018993 = 131 ⋅740603.

It is a cyclic number.

It is not a de Polignac number, because 39981079 - 2¹¹ = 39979031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39981049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25227 + ... + 26764.

It is an arithmetic number, because the mean of its divisors is an integer number (10008460).

Almost surely, 2^39981079 is an apocalyptic number.

39981079 is a deficient number, since it is larger than the sum of its proper divisors (52761).

39981079 is an equidigital number, since it uses as much as digits as its factorization.

39981079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52760.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 39981079 is about 6323.0593070127. The cubic root of 39981079 is about 341.9412567391.

The spelling of 39981079 in words is "thirty-nine million, nine hundred eighty-one thousand, seventy-nine".