18258380 has 72 divisors (see below), whose sum is σ = 46118016. Its totient is φ = 6048000.

The previous prime is 18258377. The next prime is 18258403. The reversal of 18258380 is 8385281.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18258380.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30080 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (640528).

Almost surely, 2^18258380 is an apocalyptic number.

18258380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18258380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23059008).

18258380 is an abundant number, since it is smaller than the sum of its proper divisors (27859636).

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

18258380 is a wasteful number, since it uses less digits than its factorization.

18258380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 18258380 is about 4272.9825649071. The cubic root of 18258380 is about 263.3221629971.

The spelling of 18258380 in words is "eighteen million, two hundred fifty-eight thousand, three hundred eighty".