72403231 has 4 divisors (see below), whose sum is σ = 72420264. Its totient is φ = 72386200.

The previous prime is 72403217. The next prime is 72403291. The reversal of 72403231 is 13230427.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72403231 - 2¹³ = 72395039 is a prime.

It is a super-2 number, since 2×72403231² = 10484455718478722, 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 (72403211) 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, 3741 + ... + 12601.

It is an arithmetic number, because the mean of its divisors is an integer number (18105066).

Almost surely, 2^72403231 is an apocalyptic number.

72403231 is a deficient number, since it is larger than the sum of its proper divisors (17033).

72403231 is an equidigital number, since it uses as much as digits as its factorization.

72403231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 72403231 is about 8509.0088141922. The cubic root of 72403231 is about 416.7919436276.

Adding to 72403231 its reverse (13230427), we get a palindrome (85633658).

The spelling of 72403231 in words is "seventy-two million, four hundred three thousand, two hundred thirty-one".