18380000 has 60 divisors (see below), whose sum is σ = 45266760. Its totient is φ = 7344000.

The previous prime is 18379987. The next prime is 18380003. The reversal of 18380000 is 8381.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18380003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19541 + ... + 20459.

It is an arithmetic number, because the mean of its divisors is an integer number (754446).

Almost surely, 2^18380000 is an apocalyptic number.

18380000 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 18380000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22633380).

18380000 is an abundant number, since it is smaller than the sum of its proper divisors (26886760).

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

18380000 is an frugal number, since it uses more digits than its factorization.

18380000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18380000 is about 4287.1902220452. The cubic root of 18380000 is about 263.9055370640.

Adding to 18380000 its reverse (8381), we get a palindrome (18388381).

The spelling of 18380000 in words is "eighteen million, three hundred eighty thousand".