72239407 has 4 divisors (see below), whose sum is σ = 72272176. Its totient is φ = 72206640.

The previous prime is 72239381. The next prime is 72239411. The reversal of 72239407 is 70493227.

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 72239407 - 2¹⁵ = 72206639 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 (72239507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12819 + ... + 17572.

It is an arithmetic number, because the mean of its divisors is an integer number (18068044).

Almost surely, 2^72239407 is an apocalyptic number.

72239407 is a deficient number, since it is larger than the sum of its proper divisors (32769).

72239407 is a wasteful number, since it uses less digits than its factorization.

72239407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32768.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 72239407 is about 8499.3768595115. The cubic root of 72239407 is about 416.4773532158.

The spelling of 72239407 in words is "seventy-two million, two hundred thirty-nine thousand, four hundred seven".