18387330 has 32 divisors (see below), whose sum is σ = 47525184. Its totient is φ = 4526016.

The previous prime is 18387323. The next prime is 18387331. The reversal of 18387330 is 3378381.

It is a junction number, because it is equal to n+sod(n) for n = 18387291 and 18387300.

It is not an unprimeable number, because it can be changed into a prime (18387331) 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, 23184 + ... + 23963.

It is an arithmetic number, because the mean of its divisors is an integer number (1485162).

Almost surely, 2^18387330 is an apocalyptic number.

18387330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18387330 is an abundant number, since it is smaller than the sum of its proper divisors (29137854).

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

18387330 is a wasteful number, since it uses less digits than its factorization.

18387330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47170.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 18387330 is about 4288.0450090921. The cubic root of 18387330 is about 263.9406145121.

The spelling of 18387330 in words is "eighteen million, three hundred eighty-seven thousand, three hundred thirty".