72400115 has 4 divisors (see below), whose sum is σ = 86880144. Its totient is φ = 57920088.

The previous prime is 72400109. The next prime is 72400147. The reversal of 72400115 is 51100427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72400115 - 2⁴ = 72400099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7240007 + ... + 7240016.

It is an arithmetic number, because the mean of its divisors is an integer number (21720036).

Almost surely, 2^72400115 is an apocalyptic number.

72400115 is a deficient number, since it is larger than the sum of its proper divisors (14480029).

72400115 is a wasteful number, since it uses less digits than its factorization.

72400115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14480028.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 72400115 is about 8508.8257121650. The cubic root of 72400115 is about 416.7859644178.

The spelling of 72400115 in words is "seventy-two million, four hundred thousand, one hundred fifteen".