18995197 has 4 divisors (see below), whose sum is σ = 20456380. Its totient is φ = 17534016.

The previous prime is 18995189. The next prime is 18995201. The reversal of 18995197 is 79159981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79159981 = 761 ⋅104021.

It can be written as a sum of positive squares in 2 ways, for example, as 5112121 + 13883076 = 2261^2 + 3726^2 .

It is a cyclic number.

It is not a de Polignac number, because 18995197 - 2³ = 18995189 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 18995197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995107) 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, 730572 + ... + 730597.

It is an arithmetic number, because the mean of its divisors is an integer number (5114095).

Almost surely, 2^18995197 is an apocalyptic number.

It is an amenable number.

18995197 is a deficient number, since it is larger than the sum of its proper divisors (1461183).

18995197 is a wasteful number, since it uses less digits than its factorization.

18995197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461182.

The product of its digits is 204120, while the sum is 49.

The square root of 18995197 is about 4358.3479668333. The cubic root of 18995197 is about 266.8176781823.

The spelling of 18995197 in words is "eighteen million, nine hundred ninety-five thousand, one hundred ninety-seven".