72139799 has 4 divisors (see below), whose sum is σ = 75276336. Its totient is φ = 69003264.

The previous prime is 72139777. The next prime is 72139807. The reversal of 72139799 is 99793127.

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 72139799 - 2²⁴ = 55362583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72109799) by changing a digit.

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, 1568234 + ... + 1568279.

It is an arithmetic number, because the mean of its divisors is an integer number (18819084).

Almost surely, 2^72139799 is an apocalyptic number.

72139799 is a deficient number, since it is larger than the sum of its proper divisors (3136537).

72139799 is a wasteful number, since it uses less digits than its factorization.

72139799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136536.

The product of its digits is 214326, while the sum is 47.

The square root of 72139799 is about 8493.5151144859. The cubic root of 72139799 is about 416.2858439015.

The spelling of 72139799 in words is "seventy-two million, one hundred thirty-nine thousand, seven hundred ninety-nine".