18213140 has 24 divisors (see below), whose sum is σ = 41725152. Its totient is φ = 6622880.

The previous prime is 18213119. The next prime is 18213149. The reversal of 18213140 is 4131281.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41174 + ... + 41613.

It is an arithmetic number, because the mean of its divisors is an integer number (1738548).

Almost surely, 2^18213140 is an apocalyptic number.

18213140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18213140 is an abundant number, since it is smaller than the sum of its proper divisors (23512012).

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

18213140 is a wasteful number, since it uses less digits than its factorization.

18213140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82807 (or 82805 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18213140 is about 4267.6855554270. The cubic root of 18213140 is about 263.1044995246.

The spelling of 18213140 in words is "eighteen million, two hundred thirteen thousand, one hundred forty".