18323140 has 48 divisors (see below), whose sum is σ = 43130304. Its totient is φ = 6480000.

The previous prime is 18323131. The next prime is 18323141. The reversal of 18323140 is 4132381.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (18323141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7015 + ... + 9265.

It is an arithmetic number, because the mean of its divisors is an integer number (898548).

Almost surely, 2^18323140 is an apocalyptic number.

18323140 is a gapful number since it is divisible by the number (10) 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 18323140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21565152).

18323140 is an abundant number, since it is smaller than the sum of its proper divisors (24807164).

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

18323140 is a wasteful number, since it uses less digits than its factorization.

18323140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308 (or 2306 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18323140 is about 4280.5537025016. The cubic root of 18323140 is about 263.6331183256.

The spelling of 18323140 in words is "eighteen million, three hundred twenty-three thousand, one hundred forty".