18897119 has 2 divisors, whose sum is σ = 18897120. Its totient is φ = 18897118.

The previous prime is 18897113. The next prime is 18897139. The reversal of 18897119 is 91179881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18897119 is a prime.

It is a super-2 number, since 2×18897119² = 714202213000322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18897119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18897113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448559 + 9448560.

It is an arithmetic number, because the mean of its divisors is an integer number (9448560).

Almost surely, 2^18897119 is an apocalyptic number.

18897119 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897119 is an equidigital number, since it uses as much as digits as its factorization.

18897119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 44.

The square root of 18897119 is about 4347.0816647494. The cubic root of 18897119 is about 266.3576651714.

The spelling of 18897119 in words is "eighteen million, eight hundred ninety-seven thousand, one hundred nineteen".