204172403 has 4 divisors (see below), whose sum is σ = 213049488. Its totient is φ = 195295320.

The previous prime is 204172393. The next prime is 204172421. The reversal of 204172403 is 304271402.

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 204172403 - 2⁴ = 204172387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 8877061 = 204172403 / (2 + 0 + 4 + 1 + 7 + 2 + 4 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204172303) 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, 4438508 + ... + 4438553.

It is an arithmetic number, because the mean of its divisors is an integer number (53262372).

Almost surely, 2^204172403 is an apocalyptic number.

204172403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

204172403 is a deficient number, since it is larger than the sum of its proper divisors (8877085).

204172403 is an equidigital number, since it uses as much as digits as its factorization.

204172403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8877084.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 204172403 is about 14288.8908946776. The cubic root of 204172403 is about 588.8423176744.

The spelling of 204172403 in words is "two hundred four million, one hundred seventy-two thousand, four hundred three".