18873197 has 4 divisors (see below), whose sum is σ = 21569376. Its totient is φ = 16177020.

The previous prime is 18873181. The next prime is 18873199. The reversal of 18873197 is 79137881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18873197 - 2⁴ = 18873181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873199) 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, 1348079 + ... + 1348092.

It is an arithmetic number, because the mean of its divisors is an integer number (5392344).

Almost surely, 2^18873197 is an apocalyptic number.

It is an amenable number.

18873197 is a deficient number, since it is larger than the sum of its proper divisors (2696179).

18873197 is an equidigital number, since it uses as much as digits as its factorization.

18873197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696178.

The product of its digits is 84672, while the sum is 44.

The square root of 18873197 is about 4344.3292923074. The cubic root of 18873197 is about 266.2452230108.

The spelling of 18873197 in words is "eighteen million, eight hundred seventy-three thousand, one hundred ninety-seven".