18378164 has 36 divisors (see below), whose sum is σ = 38035872. Its totient is φ = 7611120.

The previous prime is 18378091. The next prime is 18378169. The reversal of 18378164 is 46187381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378169) 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, 26567 + ... + 27249.

It is an arithmetic number, because the mean of its divisors is an integer number (1056552).

Almost surely, 2^18378164 is an apocalyptic number.

18378164 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 18378164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19017936).

18378164 is an abundant number, since it is smaller than the sum of its proper divisors (19657708).

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

18378164 is a wasteful number, since it uses less digits than its factorization.

18378164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 723 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 18378164 is about 4286.9760904395. The cubic root of 18378164 is about 263.8967494923.

It can be divided in two parts, 1837 and 8164, that added together give a palindrome (10001).

The spelling of 18378164 in words is "eighteen million, three hundred seventy-eight thousand, one hundred sixty-four".