18690919 has 8 divisors (see below), whose sum is σ = 20169072. Its totient is φ = 17218560.

The previous prime is 18690911. The next prime is 18690929. The reversal of 18690919 is 91909681.

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

It is a cyclic number.

It is not a de Polignac number, because 18690919 - 2³ = 18690911 is a prime.

It is a super-2 number, since 2×18690919² = 698700906129122, 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 (18690911) 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, 7212 + ... + 9454.

It is an arithmetic number, because the mean of its divisors is an integer number (2521134).

Almost surely, 2^18690919 is an apocalyptic number.

18690919 is a deficient number, since it is larger than the sum of its proper divisors (1478153).

18690919 is a wasteful number, since it uses less digits than its factorization.

18690919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 18690919 is about 4323.2995501122. The cubic root of 18690919 is about 265.3853134542.

The spelling of 18690919 in words is "eighteen million, six hundred ninety thousand, nine hundred nineteen".