18694144 has 60 divisors (see below), whose sum is σ = 42990304. Its totient is φ = 7962624.

The previous prime is 18694133. The next prime is 18694153. The reversal of 18694144 is 44149681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114607 + ... + 114769.

Almost surely, 2^18694144 is an apocalyptic number.

18694144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18694144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21495152).

18694144 is an abundant number, since it is smaller than the sum of its proper divisors (24296160).

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

18694144 is an frugal number, since it uses more digits than its factorization.

18694144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 172 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 18694144 is about 4323.6725130380. The cubic root of 18694144 is about 265.4005760962.

The spelling of 18694144 in words is "eighteen million, six hundred ninety-four thousand, one hundred forty-four".