72398431 has 6 divisors (see below), whose sum is σ = 84218640. Its totient is φ = 62055756.

The previous prime is 72398429. The next prime is 72398437. The reversal of 72398431 is 13489327.

It is not a de Polignac number, because 72398431 - 2¹ = 72398429 is a prime.

It is a super-2 number, since 2×72398431² = 10483065622523522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72398437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 738711 + ... + 738808.

It is an arithmetic number, because the mean of its divisors is an integer number (14036440).

Almost surely, 2^72398431 is an apocalyptic number.

72398431 is a deficient number, since it is larger than the sum of its proper divisors (11820209).

72398431 is a wasteful number, since it uses less digits than its factorization.

72398431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477533 (or 1477526 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 72398431 is about 8508.7267555140. The cubic root of 72398431 is about 416.7827329635.

The spelling of 72398431 in words is "seventy-two million, three hundred ninety-eight thousand, four hundred thirty-one".