18117450 has 144 divisors (see below), whose sum is σ = 55517280. Its totient is φ = 4199040.

The previous prime is 18117443. The next prime is 18117497. The reversal of 18117450 is 5471181.

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 71 ways as a sum of consecutive naturals, for example, 111069 + ... + 111231.

Almost surely, 2^18117450 is an apocalyptic number.

18117450 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 18117450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27758640).

18117450 is an abundant number, since it is smaller than the sum of its proper divisors (37399830).

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

18117450 is a wasteful number, since it uses less digits than its factorization.

18117450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 18117450 is about 4256.4597965915. The cubic root of 18117450 is about 262.6429153744.

It can be divided in two parts, 1811 and 7450, that added together give a cube (9261 = 21³).

The spelling of 18117450 in words is "eighteen million, one hundred seventeen thousand, four hundred fifty".