72139412 has 12 divisors (see below), whose sum is σ = 126440160. Its totient is φ = 36013656.

The previous prime is 72139411. The next prime is 72139439. The reversal of 72139412 is 21493127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72139411) 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, 11048 + ... + 16319.

It is an arithmetic number, because the mean of its divisors is an integer number (10536680).

Almost surely, 2^72139412 is an apocalyptic number.

It is an amenable number.

72139412 is a deficient number, since it is larger than the sum of its proper divisors (54300748).

72139412 is a wasteful number, since it uses less digits than its factorization.

72139412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28030 (or 28028 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 72139412 is about 8493.4923323684. The cubic root of 72139412 is about 416.2850995000.

The spelling of 72139412 in words is "seventy-two million, one hundred thirty-nine thousand, four hundred twelve".