18018450 has 72 divisors (see below), whose sum is σ = 50236368. Its totient is φ = 4801680.

The previous prime is 18018443. The next prime is 18018461. The reversal of 18018450 is 5481081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11409 + ... + 12891.

Almost surely, 2^18018450 is an apocalyptic number.

18018450 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 18018450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25118184).

18018450 is an abundant number, since it is smaller than the sum of its proper divisors (32217918).

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

18018450 is a wasteful number, since it uses less digits than its factorization.

18018450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1493 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18018450 is about 4244.8144835788. The cubic root of 18018450 is about 262.1636508424.

The spelling of 18018450 in words is "eighteen million, eighteen thousand, four hundred fifty".