18994164 has 36 divisors (see below), whose sum is σ = 51557184. Its totient is φ = 5426736.

The previous prime is 18994163. The next prime is 18994169. The reversal of 18994164 is 46149981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15564 + ... + 16739.

It is an arithmetic number, because the mean of its divisors is an integer number (1432144).

Almost surely, 2^18994164 is an apocalyptic number.

18994164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18994164 is an abundant number, since it is smaller than the sum of its proper divisors (32563020).

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

18994164 is a wasteful number, since it uses less digits than its factorization.

18994164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32324 (or 32315 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 18994164 is about 4358.2294570158. The cubic root of 18994164 is about 266.8128413867.

The spelling of 18994164 in words is "eighteen million, nine hundred ninety-four thousand, one hundred sixty-four".