72453139 has 4 divisors (see below), whose sum is σ = 79039800. Its totient is φ = 65866480.

The previous prime is 72453131. The next prime is 72453211. The reversal of 72453139 is 93135427.

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 72453139 - 2³ = 72453131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72453131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3293314 + ... + 3293335.

It is an arithmetic number, because the mean of its divisors is an integer number (19759950).

Almost surely, 2^72453139 is an apocalyptic number.

72453139 is a deficient number, since it is larger than the sum of its proper divisors (6586661).

72453139 is a wasteful number, since it uses less digits than its factorization.

72453139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6586660.

The product of its digits is 22680, while the sum is 34.

The square root of 72453139 is about 8511.9409654908. The cubic root of 72453139 is about 416.8876873967.

The spelling of 72453139 in words is "seventy-two million, four hundred fifty-three thousand, one hundred thirty-nine".