18996197 has 4 divisors (see below), whose sum is σ = 20723136. Its totient is φ = 17269260.

The previous prime is 18996169. The next prime is 18996199. The reversal of 18996197 is 79169981.

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 18996197 - 2¹⁶ = 18930661 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 (18996199) 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, 863453 + ... + 863474.

It is an arithmetic number, because the mean of its divisors is an integer number (5180784).

Almost surely, 2^18996197 is an apocalyptic number.

It is an amenable number.

18996197 is a deficient number, since it is larger than the sum of its proper divisors (1726939).

18996197 is a wasteful number, since it uses less digits than its factorization.

18996197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726938.

The product of its digits is 244944, while the sum is 50.

The square root of 18996197 is about 4358.4626876916. The cubic root of 18996197 is about 266.8223602957.

The spelling of 18996197 in words is "eighteen million, nine hundred ninety-six thousand, one hundred ninety-seven".