18972203 has 4 divisors (see below), whose sum is σ = 19970760. Its totient is φ = 17973648.

The previous prime is 18972199. The next prime is 18972229. The reversal of 18972203 is 30227981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30227981 = 7 ⋅4318283.

It is a cyclic number.

It is not a de Polignac number, because 18972203 - 2² = 18972199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18972203.

It is not an unprimeable number, because it can be changed into a prime (18972103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499250 + ... + 499287.

It is an arithmetic number, because the mean of its divisors is an integer number (4992690).

Almost surely, 2^18972203 is an apocalyptic number.

18972203 is a deficient number, since it is larger than the sum of its proper divisors (998557).

18972203 is an equidigital number, since it uses as much as digits as its factorization.

18972203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998556.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18972203 is about 4355.7092419031. The cubic root of 18972203 is about 266.7099723072.

The spelling of 18972203 in words is "eighteen million, nine hundred seventy-two thousand, two hundred three".