18345380 has 48 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 6809088.

The previous prime is 18345373. The next prime is 18345389. The reversal of 18345380 is 8354381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18345389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26519 + ... + 27201.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^18345380 is an apocalyptic number.

18345380 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 18345380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20684160).

18345380 is an abundant number, since it is smaller than the sum of its proper divisors (23022940).

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

18345380 is a wasteful number, since it uses less digits than its factorization.

18345380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 18345380 is about 4283.1507094661. The cubic root of 18345380 is about 263.7397381511.

Subtracting from 18345380 its reverse (8354381), we obtain a palindrome (9990999).

The spelling of 18345380 in words is "eighteen million, three hundred forty-five thousand, three hundred eighty".