18450990 has 56 divisors (see below), whose sum is σ = 49814568. Its totient is φ = 4918320.

The previous prime is 18450961. The next prime is 18451019. The reversal of 18450990 is 9905481.

It is an interprime number because it is at equal distance from previous prime (18450961) and next prime (18451019).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6025 + ... + 8555.

Almost surely, 2^18450990 is an apocalyptic number.

18450990 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 18450990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24907284).

18450990 is an abundant number, since it is smaller than the sum of its proper divisors (31363578).

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

18450990 is an equidigital number, since it uses as much as digits as its factorization.

18450990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18450990 is about 4295.4615584358. The cubic root of 18450990 is about 264.2448657866.

The spelling of 18450990 in words is "eighteen million, four hundred fifty thousand, nine hundred ninety".