72149739 has 4 divisors (see below), whose sum is σ = 96199656. Its totient is φ = 48099824.

The previous prime is 72149731. The next prime is 72149761. The reversal of 72149739 is 93794127.

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 72149739 - 2³ = 72149731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72149739.

It is not an unprimeable number, because it can be changed into a prime (72149731) 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, 12024954 + ... + 12024959.

It is an arithmetic number, because the mean of its divisors is an integer number (24049914).

Almost surely, 2^72149739 is an apocalyptic number.

72149739 is a deficient number, since it is larger than the sum of its proper divisors (24049917).

72149739 is a wasteful number, since it uses less digits than its factorization.

72149739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24049916.

The product of its digits is 95256, while the sum is 42.

The square root of 72149739 is about 8494.1002466418. The cubic root of 72149739 is about 416.3049627573.

The spelling of 72149739 in words is "seventy-two million, one hundred forty-nine thousand, seven hundred thirty-nine".