140432231 has 4 divisors (see below), whose sum is σ = 141244152. Its totient is φ = 139620312.

The previous prime is 140432209. The next prime is 140432251. The reversal of 140432231 is 132234041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140432231 is a prime.

It is a super-2 number, since 2×140432231² = 39442423007274722, 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 (140432251) 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, 405701 + ... + 406046.

It is an arithmetic number, because the mean of its divisors is an integer number (35311038).

Almost surely, 2^140432231 is an apocalyptic number.

140432231 is a deficient number, since it is larger than the sum of its proper divisors (811921).

140432231 is an equidigital number, since it uses as much as digits as its factorization.

140432231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811920.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 140432231 is about 11850.4105836043. The cubic root of 140432231 is about 519.7832318889.

Adding to 140432231 its reverse (132234041), we get a palindrome (272666272).

The spelling of 140432231 in words is "one hundred forty million, four hundred thirty-two thousand, two hundred thirty-one".