203430423 has 16 divisors (see below), whose sum is σ = 323467776. Its totient is φ = 111191520.

The previous prime is 203430421. The next prime is 203430431. The reversal of 203430423 is 324034302.

It is not a de Polignac number, because 203430423 - 2¹ = 203430421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 203430423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203430421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210108 + ... + 211073.

It is an arithmetic number, because the mean of its divisors is an integer number (20216736).

Almost surely, 2^203430423 is an apocalyptic number.

203430423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

203430423 is a deficient number, since it is larger than the sum of its proper divisors (120037353).

203430423 is a wasteful number, since it uses less digits than its factorization.

203430423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421214.

The product of its (nonzero) digits is 1728, while the sum is 21.

The square root of 203430423 is about 14262.9037366169. The cubic root of 203430423 is about 588.1281507208.

Adding to 203430423 its reverse (324034302), we get a palindrome (527464725).

The spelling of 203430423 in words is "two hundred three million, four hundred thirty thousand, four hundred twenty-three".