72139211 has 16 divisors (see below), whose sum is σ = 79691040. Its totient is φ = 64995840.

The previous prime is 72139183. The next prime is 72139229. The reversal of 72139211 is 11293127.

It is a cyclic number.

It is not a de Polignac number, because 72139211 - 2⁶ = 72139147 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 64025 + ... + 65141.

It is an arithmetic number, because the mean of its divisors is an integer number (4980690).

Almost surely, 2^72139211 is an apocalyptic number.

72139211 is a deficient number, since it is larger than the sum of its proper divisors (7551829).

72139211 is a wasteful number, since it uses less digits than its factorization.

72139211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294.

The product of its digits is 756, while the sum is 26.

The square root of 72139211 is about 8493.4804997716. The cubic root of 72139211 is about 416.2847128719.

The spelling of 72139211 in words is "seventy-two million, one hundred thirty-nine thousand, two hundred eleven".