72459391 has 2 divisors, whose sum is σ = 72459392. Its totient is φ = 72459390.

The previous prime is 72459311. The next prime is 72459397. The reversal of 72459391 is 19395427.

It is a strong prime.

It is an emirp because it is prime and its reverse (19395427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72459391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72459397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36229695 + 36229696.

It is an arithmetic number, because the mean of its divisors is an integer number (36229696).

Almost surely, 2^72459391 is an apocalyptic number.

72459391 is a deficient number, since it is larger than the sum of its proper divisors (1).

72459391 is an equidigital number, since it uses as much as digits as its factorization.

72459391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 72459391 is about 8512.3082063563. The cubic root of 72459391 is about 416.8996781670.

The spelling of 72459391 in words is "seventy-two million, four hundred fifty-nine thousand, three hundred ninety-one".