72974309 has 2 divisors, whose sum is σ = 72974310. Its totient is φ = 72974308.

The previous prime is 72974303. The next prime is 72974329. The reversal of 72974309 is 90347927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51165409 + 21808900 = 7153^2 + 4670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72974309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72974303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487154 + 36487155.

It is an arithmetic number, because the mean of its divisors is an integer number (36487155).

Almost surely, 2^72974309 is an apocalyptic number.

It is an amenable number.

72974309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974309 is an equidigital number, since it uses as much as digits as its factorization.

72974309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 72974309 is about 8542.5001609599. The cubic root of 72974309 is about 417.8848858475.

The spelling of 72974309 in words is "seventy-two million, nine hundred seventy-four thousand, three hundred nine".