18898919 has 8 divisors (see below), whose sum is σ = 20405952. Its totient is φ = 17399520.

The previous prime is 18898861. The next prime is 18898921. The reversal of 18898919 is 91989881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18898919 is a prime.

It is a super-2 number, since 2×18898919² = 714338278737122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18898969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3917 + ... + 7289.

It is an arithmetic number, because the mean of its divisors is an integer number (2550744).

Almost surely, 2^18898919 is an apocalyptic number.

18898919 is a deficient number, since it is larger than the sum of its proper divisors (1507033).

18898919 is a wasteful number, since it uses less digits than its factorization.

18898919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817.

The product of its digits is 373248, while the sum is 53.

The square root of 18898919 is about 4347.2886952674. The cubic root of 18898919 is about 266.3661219909.

The spelling of 18898919 in words is "eighteen million, eight hundred ninety-eight thousand, nine hundred nineteen".