72331439 has 4 divisors (see below), whose sum is σ = 72355800. Its totient is φ = 72307080.

The previous prime is 72331409. The next prime is 72331459. The reversal of 72331439 is 93413327.

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 72331439 - 2⁸ = 72331183 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 (72331409) 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, 6989 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (18088950).

Almost surely, 2^72331439 is an apocalyptic number.

72331439 is a deficient number, since it is larger than the sum of its proper divisors (24361).

72331439 is a wasteful number, since it uses less digits than its factorization.

72331439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24360.

The product of its digits is 13608, while the sum is 32.

The square root of 72331439 is about 8504.7891802208. The cubic root of 72331439 is about 416.6541402812.

The spelling of 72331439 in words is "seventy-two million, three hundred thirty-one thousand, four hundred thirty-nine".