73979309 has 2 divisors, whose sum is σ = 73979310. Its totient is φ = 73979308.

The previous prime is 73979303. The next prime is 73979327. The reversal of 73979309 is 90397937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 7963684 = 8125^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 73979309 - 2²⁰ = 72930733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73979303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36989654 + 36989655.

It is an arithmetic number, because the mean of its divisors is an integer number (36989655).

Almost surely, 2^73979309 is an apocalyptic number.

It is an amenable number.

73979309 is a deficient number, since it is larger than the sum of its proper divisors (1).

73979309 is an equidigital number, since it uses as much as digits as its factorization.

73979309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 321489, while the sum is 47.

The square root of 73979309 is about 8601.1225430173. The cubic root of 73979309 is about 419.7945121029.

The spelling of 73979309 in words is "seventy-three million, nine hundred seventy-nine thousand, three hundred nine".