72974399 has 2 divisors, whose sum is σ = 72974400. Its totient is φ = 72974398.

The previous prime is 72974359. The next prime is 72974413. The reversal of 72974399 is 99347927.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72974399 is a prime.

It is a super-2 number, since 2×72974399² = 10650525818822402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72974309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36487199 + 36487200.

It is an arithmetic number, because the mean of its divisors is an integer number (36487200).

Almost surely, 2^72974399 is an apocalyptic number.

72974399 is a deficient number, since it is larger than the sum of its proper divisors (1).

72974399 is an equidigital number, since it uses as much as digits as its factorization.

72974399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 72974399 is about 8542.5054287369. The cubic root of 72974399 is about 417.8850576414.

The spelling of 72974399 in words is "seventy-two million, nine hundred seventy-four thousand, three hundred ninety-nine".