72139159 has 4 divisors (see below), whose sum is σ = 74088904. Its totient is φ = 70189416.

The previous prime is 72139147. The next prime is 72139169. The reversal of 72139159 is 95193127.

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 72139159 - 2⁵ = 72139127 is a prime.

It is a super-2 number, since 2×72139159² = 10408116522454562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1949707 = 72139159 / (7 + 2 + 1 + 3 + 9 + 1 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72139169) 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, 974817 + ... + 974890.

It is an arithmetic number, because the mean of its divisors is an integer number (18522226).

Almost surely, 2^72139159 is an apocalyptic number.

72139159 is a deficient number, since it is larger than the sum of its proper divisors (1949745).

72139159 is a wasteful number, since it uses less digits than its factorization.

72139159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949744.

The product of its digits is 17010, while the sum is 37.

The square root of 72139159 is about 8493.4774385996. The cubic root of 72139159 is about 416.2846128486.

The spelling of 72139159 in words is "seventy-two million, one hundred thirty-nine thousand, one hundred fifty-nine".