72400439 has 2 divisors, whose sum is σ = 72400440. Its totient is φ = 72400438.

The previous prime is 72400429. The next prime is 72400457. The reversal of 72400439 is 93400427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72400439 - 2⁸ = 72400183 is a prime.

It is a Chen prime.

It is equal to p_4250954 and since 72400439 and 4250954 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72400429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200219 + 36200220.

It is an arithmetic number, because the mean of its divisors is an integer number (36200220).

Almost surely, 2^72400439 is an apocalyptic number.

72400439 is a deficient number, since it is larger than the sum of its proper divisors (1).

72400439 is an equidigital number, since it uses as much as digits as its factorization.

72400439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 72400439 is about 8508.8447511986. The cubic root of 72400439 is about 416.7865861408.

The spelling of 72400439 in words is "seventy-two million, four hundred thousand, four hundred thirty-nine".