72969839 has 4 divisors (see below), whose sum is σ = 74666856. Its totient is φ = 71272824.

The previous prime is 72969781. The next prime is 72969859. The reversal of 72969839 is 93896927.

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 72969839 - 2⁸ = 72969583 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 (72969859) 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, 848444 + ... + 848529.

It is an arithmetic number, because the mean of its divisors is an integer number (18666714).

Almost surely, 2^72969839 is an apocalyptic number.

72969839 is a deficient number, since it is larger than the sum of its proper divisors (1697017).

72969839 is a wasteful number, since it uses less digits than its factorization.

72969839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697016.

The product of its digits is 1469664, while the sum is 53.

The square root of 72969839 is about 8542.2385239468. The cubic root of 72969839 is about 417.8763532392.

The spelling of 72969839 in words is "seventy-two million, nine hundred sixty-nine thousand, eight hundred thirty-nine".