18305190 has 88 divisors (see below), whose sum is σ = 51018048. Its totient is φ = 4723920.

The previous prime is 18305153. The next prime is 18305191. The reversal of 18305190 is 9150381.

It is a super-2 number, since 2×18305190² = 670159961872200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18305191) 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 43 ways as a sum of consecutive naturals, for example, 590475 + ... + 590505.

Almost surely, 2^18305190 is an apocalyptic number.

18305190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18305190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25509024).

18305190 is an abundant number, since it is smaller than the sum of its proper divisors (32712858).

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

18305190 is an frugal number, since it uses more digits than its factorization.

18305190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18305190 is about 4278.4564973831. The cubic root of 18305190 is about 263.5470020705.

The spelling of 18305190 in words is "eighteen million, three hundred five thousand, one hundred ninety".