231240403 has 4 divisors (see below), whose sum is σ = 239214240. Its totient is φ = 223266568.

The previous prime is 231240389. The next prime is 231240419. The reversal of 231240403 is 304042132.

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 231240403 - 2⁵ = 231240371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231240473) 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, 3986875 + ... + 3986932.

It is an arithmetic number, because the mean of its divisors is an integer number (59803560).

Almost surely, 2^231240403 is an apocalyptic number.

231240403 is a deficient number, since it is larger than the sum of its proper divisors (7973837).

231240403 is an equidigital number, since it uses as much as digits as its factorization.

231240403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7973836.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 231240403 is about 15206.5907750554. The cubic root of 231240403 is about 613.7920219609.

Adding to 231240403 its reverse (304042132), we get a palindrome (535282535).

The spelling of 231240403 in words is "two hundred thirty-one million, two hundred forty thousand, four hundred three".