79383721 has 2 divisors, whose sum is σ = 79383722. Its totient is φ = 79383720.

The previous prime is 79383709. The next prime is 79383737. The reversal of 79383721 is 12738397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76807696 + 2576025 = 8764^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 79383721 - 2⁷ = 79383593 is a prime.

It is not a weakly prime, because it can be changed into another prime (79383781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39691860 + 39691861.

It is an arithmetic number, because the mean of its divisors is an integer number (39691861).

Almost surely, 2^79383721 is an apocalyptic number.

It is an amenable number.

79383721 is a deficient number, since it is larger than the sum of its proper divisors (1).

79383721 is an equidigital number, since it uses as much as digits as its factorization.

79383721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 79383721 is about 8909.7542614822. The cubic root of 79383721 is about 429.7776405780. Note that the first 3 decimals are identical.

The spelling of 79383721 in words is "seventy-nine million, three hundred eighty-three thousand, seven hundred twenty-one".