231403 has 4 divisors (see below), whose sum is σ = 241488. Its totient is φ = 221320.

The previous prime is 231379. The next prime is 231409. The reversal of 231403 is 304132.

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 231403 - 2⁹ = 230891 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

231403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (231409) 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, 5008 + ... + 5053.

It is an arithmetic number, because the mean of its divisors is an integer number (60372).

2²³¹⁴⁰³ is an apocalyptic number.

231403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231403 is a deficient number, since it is larger than the sum of its proper divisors (10085).

231403 is a wasteful number, since it uses less digits than its factorization.

231403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 231403 is about 481.0436570624. The cubic root of 231403 is about 61.3935851150.

Adding to 231403 its reverse (304132), we get a palindrome (535535).

The spelling of 231403 in words is "two hundred thirty-one thousand, four hundred three".