72409939 has 16 divisors (see below), whose sum is σ = 85229568. Its totient is φ = 60232032.

The previous prime is 72409921. The next prime is 72409943. The reversal of 72409939 is 93990427.

It is not a de Polignac number, because 72409939 - 2⁵ = 72409907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72409895 and 72409904.

It is not an unprimeable number, because it can be changed into a prime (72409339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40917 + ... + 42649.

It is an arithmetic number, because the mean of its divisors is an integer number (5326848).

Almost surely, 2^72409939 is an apocalyptic number.

72409939 is a deficient number, since it is larger than the sum of its proper divisors (12819629).

72409939 is a wasteful number, since it uses less digits than its factorization.

72409939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 72409939 is about 8509.4029755324. The cubic root of 72409939 is about 416.8048148489.

The spelling of 72409939 in words is "seventy-two million, four hundred nine thousand, nine hundred thirty-nine".