18913894 has 24 divisors (see below), whose sum is σ = 30879288. Its totient is φ = 8682240.

The previous prime is 18913891. The next prime is 18913907. The reversal of 18913894 is 49831981.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 18913894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18913891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24474 + ... + 25234.

It is an arithmetic number, because the mean of its divisors is an integer number (1286637).

Almost surely, 2^18913894 is an apocalyptic number.

18913894 is a deficient number, since it is larger than the sum of its proper divisors (11965394).

18913894 is a wasteful number, since it uses less digits than its factorization.

18913894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 823 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 18913894 is about 4349.0106921000. The cubic root of 18913894 is about 266.4364572235.

The spelling of 18913894 in words is "eighteen million, nine hundred thirteen thousand, eight hundred ninety-four".