72239399 has 4 divisors (see below), whose sum is σ = 72288720. Its totient is φ = 72190080.

The previous prime is 72239381. The next prime is 72239411. The reversal of 72239399 is 99393227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72239399 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 (72239369) 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, 22394 + ... + 25415.

It is an arithmetic number, because the mean of its divisors is an integer number (18072180).

Almost surely, 2^72239399 is an apocalyptic number.

72239399 is a deficient number, since it is larger than the sum of its proper divisors (49321).

72239399 is a wasteful number, since it uses less digits than its factorization.

72239399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49320.

The product of its digits is 183708, while the sum is 44.

The square root of 72239399 is about 8499.3763888888. The cubic root of 72239399 is about 416.4773378418.

The spelling of 72239399 in words is "seventy-two million, two hundred thirty-nine thousand, three hundred ninety-nine".