203423431 has 4 divisors (see below), whose sum is σ = 212267952. Its totient is φ = 194578912.

The previous prime is 203423357. The next prime is 203423483. The reversal of 203423431 is 134324302.

It is a happy number.

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 203423431 - 2¹⁹ = 202899143 is a prime.

It is a super-2 number, since 2×203423431² = 82762184559623522, 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 (203421431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4422226 + ... + 4422271.

It is an arithmetic number, because the mean of its divisors is an integer number (53066988).

Almost surely, 2^203423431 is an apocalyptic number.

203423431 is a deficient number, since it is larger than the sum of its proper divisors (8844521).

203423431 is an equidigital number, since it uses as much as digits as its factorization.

203423431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844520.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 203423431 is about 14262.6586231319. The cubic root of 203423431 is about 588.1214125625.

Adding to 203423431 its reverse (134324302), we get a palindrome (337747733).

The spelling of 203423431 in words is "two hundred three million, four hundred twenty-three thousand, four hundred thirty-one".