18996897 has 4 divisors (see below), whose sum is σ = 25329200. Its totient is φ = 12664596.

The previous prime is 18996881. The next prime is 18996917. The reversal of 18996897 is 79869981.

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 not a de Polignac number, because 18996897 - 2⁴ = 18996881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18996877) 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, 3166147 + ... + 3166152.

It is an arithmetic number, because the mean of its divisors is an integer number (6332300).

Almost surely, 2^18996897 is an apocalyptic number.

It is an amenable number.

18996897 is a deficient number, since it is larger than the sum of its proper divisors (6332303).

18996897 is an equidigital number, since it uses as much as digits as its factorization.

18996897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332302.

The product of its digits is 1959552, while the sum is 57.

The square root of 18996897 is about 4358.5429904958. The cubic root of 18996897 is about 266.8256376773.

The spelling of 18996897 in words is "eighteen million, nine hundred ninety-six thousand, eight hundred ninety-seven".