18408894 has 32 divisors (see below), whose sum is σ = 42351360. Its totient is φ = 5225472.

The previous prime is 18408883. The next prime is 18408917. The reversal of 18408894 is 49880481.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5502 + ... + 8190.

It is an arithmetic number, because the mean of its divisors is an integer number (1323480).

Almost surely, 2^18408894 is an apocalyptic number.

18408894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18408894 is an abundant number, since it is smaller than the sum of its proper divisors (23942466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18408894 is a wasteful number, since it uses less digits than its factorization.

18408894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 18408894 is about 4290.5587048775. The cubic root of 18408894 is about 264.0437542264.

The spelling of 18408894 in words is "eighteen million, four hundred eight thousand, eight hundred ninety-four".