18198450 has 72 divisors (see below), whose sum is σ = 50260548. Its totient is φ = 4717440.

The previous prime is 18198431. The next prime is 18198469. The reversal of 18198450 is 5489181.

18198450 is a `hidden beast` number, since 18 + 198 + 450 = 666.

It is an interprime number because it is at equal distance from previous prime (18198431) and next prime (18198469).

It can be written as a sum of positive squares in 6 ways, for example, as 15848361 + 2350089 = 3981^2 + 1533^2 .

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, 16104 + ... + 17196.

Almost surely, 2^18198450 is an apocalyptic number.

18198450 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 18198450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25130274).

18198450 is an abundant number, since it is smaller than the sum of its proper divisors (32062098).

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

18198450 is a wasteful number, since it uses less digits than its factorization.

18198450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18198450 is about 4265.9641348703. The cubic root of 18198450 is about 263.0337439294.

It can be divided in two parts, 18 and 198450, that multiplied together give a square (3572100 = 1890²).

The spelling of 18198450 in words is "eighteen million, one hundred ninety-eight thousand, four hundred fifty".