72409297 has 2 divisors, whose sum is σ = 72409298. Its totient is φ = 72409296.

The previous prime is 72409261. The next prime is 72409319. The reversal of 72409297 is 79290427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68707521 + 3701776 = 8289^2 + 1924^2 .

It is an emirp because it is prime and its reverse (79290427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72409297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72409217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36204648 + 36204649.

It is an arithmetic number, because the mean of its divisors is an integer number (36204649).

Almost surely, 2^72409297 is an apocalyptic number.

It is an amenable number.

72409297 is a deficient number, since it is larger than the sum of its proper divisors (1).

72409297 is an equidigital number, since it uses as much as digits as its factorization.

72409297 is an evil number, because the sum of its binary digits is even.

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

The square root of 72409297 is about 8509.3652524733. The cubic root of 72409297 is about 416.8035830222.

The spelling of 72409297 in words is "seventy-two million, four hundred nine thousand, two hundred ninety-seven".