79393939 has 2 divisors, whose sum is σ = 79393940. Its totient is φ = 79393938.

The previous prime is 79393901. The next prime is 79393943. The reversal of 79393939 is 93939397.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79393939 - 2¹⁵ = 79361171 is a prime.

It is not a weakly prime, because it can be changed into another prime (79393949) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39696969 + 39696970.

It is an arithmetic number, because the mean of its divisors is an integer number (39696970).

Almost surely, 2^79393939 is an apocalyptic number.

79393939 is a deficient number, since it is larger than the sum of its proper divisors (1).

79393939 is an equidigital number, since it uses as much as digits as its factorization.

79393939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1240029, while the sum is 52.

The square root of 79393939 is about 8910.3276595196. The cubic root of 79393939 is about 429.7960796209.

The spelling of 79393939 in words is "seventy-nine million, three hundred ninety-three thousand, nine hundred thirty-nine".