18189340 has 24 divisors (see below), whose sum is σ = 41136480. Its totient is φ = 6715968.

The previous prime is 18189331. The next prime is 18189341. The reversal of 18189340 is 4398181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18189296 and 18189305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34720 + ... + 35239.

It is an arithmetic number, because the mean of its divisors is an integer number (1714020).

Almost surely, 2^18189340 is an apocalyptic number.

18189340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18189340 is an abundant number, since it is smaller than the sum of its proper divisors (22947140).

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

18189340 is a wasteful number, since it uses less digits than its factorization.

18189340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69981 (or 69979 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18189340 is about 4264.8962472726. The cubic root of 18189340 is about 262.9898457336.

The spelling of 18189340 in words is "eighteen million, one hundred eighty-nine thousand, three hundred forty".