72139494 has 32 divisors (see below), whose sum is σ = 165597696. Its totient is φ = 20522880.

The previous prime is 72139489. The next prime is 72139537. The reversal of 72139494 is 49493127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6559 + ... + 13685.

It is an arithmetic number, because the mean of its divisors is an integer number (5174928).

Almost surely, 2^72139494 is an apocalyptic number.

72139494 is an abundant number, since it is smaller than the sum of its proper divisors (93458202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72139494 is a wasteful number, since it uses less digits than its factorization.

72139494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380.

The product of its digits is 54432, while the sum is 39.

The square root of 72139494 is about 8493.4971595922. The cubic root of 72139494 is about 416.2852572287.

The spelling of 72139494 in words is "seventy-two million, one hundred thirty-nine thousand, four hundred ninety-four".