18917854 has 4 divisors (see below), whose sum is σ = 28376784. Its totient is φ = 9458926.

The previous prime is 18917849. The next prime is 18917861. The reversal of 18917854 is 45871981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18917854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729462 + ... + 4729465.

It is an arithmetic number, because the mean of its divisors is an integer number (7094196).

Almost surely, 2^18917854 is an apocalyptic number.

18917854 is a deficient number, since it is larger than the sum of its proper divisors (9458930).

18917854 is an equidigital number, since it uses as much as digits as its factorization.

18917854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458929.

The product of its digits is 80640, while the sum is 43.

The square root of 18917854 is about 4349.4659442281. The cubic root of 18917854 is about 266.4550505170.

The spelling of 18917854 in words is "eighteen million, nine hundred seventeen thousand, eight hundred fifty-four".