18297090 has 120 divisors (see below), whose sum is σ = 57355452. Its totient is φ = 4173120.

The previous prime is 18297089. The next prime is 18297091. The reversal of 18297090 is 9079281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18297089) and next prime (18297091).

It can be written as a sum of positive squares in 2 ways, for example, as 17816841 + 480249 = 4221^2 + 693^2 .

It is not an unprimeable number, because it can be changed into a prime (18297091) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 39460 + ... + 39920.

Almost surely, 2^18297090 is an apocalyptic number.

18297090 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 18297090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28677726).

18297090 is an abundant number, since it is smaller than the sum of its proper divisors (39058362).

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

18297090 is a wasteful number, since it uses less digits than its factorization.

18297090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 18297090 is about 4277.5097895855. The cubic root of 18297090 is about 263.5081233761.

The spelling of 18297090 in words is "eighteen million, two hundred ninety-seven thousand, ninety".