72139492 has 12 divisors (see below), whose sum is σ = 129656380. Its totient is φ = 35094816.

The previous prime is 72139489. The next prime is 72139537. The reversal of 72139492 is 29493127.

It can be written as a sum of positive squares in 2 ways, for example, as 69655716 + 2483776 = 8346^2 + 1576^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243567 + ... + 243862.

Almost surely, 2^72139492 is an apocalyptic number.

It is an amenable number.

72139492 is a deficient number, since it is larger than the sum of its proper divisors (57516888).

72139492 is a wasteful number, since it uses less digits than its factorization.

72139492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487470 (or 487468 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 72139492 is about 8493.4970418550. The cubic root of 72139492 is about 416.2852533817.

The spelling of 72139492 in words is "seventy-two million, one hundred thirty-nine thousand, four hundred ninety-two".