18249390 has 72 divisors (see below), whose sum is σ = 49260744. Its totient is φ = 4687200.

The previous prime is 18249389. The next prime is 18249401. The reversal of 18249390 is 9394281.

18249390 is a `hidden beast` number, since 1 + 82 + 493 + 90 = 666.

It is a super-3 number, since 3×18249390³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86385 + ... + 86595.

It is an arithmetic number, because the mean of its divisors is an integer number (684177).

Almost surely, 2^18249390 is an apocalyptic number.

18249390 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 18249390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24630372).

18249390 is an abundant number, since it is smaller than the sum of its proper divisors (31011354).

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

18249390 is a wasteful number, since it uses less digits than its factorization.

18249390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18249390 is about 4271.9304769624. The cubic root of 18249390 is about 263.2789380071.

The spelling of 18249390 in words is "eighteen million, two hundred forty-nine thousand, three hundred ninety".