18986250 has 80 divisors (see below), whose sum is σ = 48809376. Its totient is φ = 4920000.

The previous prime is 18986249. The next prime is 18986251. The reversal of 18986250 is 5268981.

It is an interprime number because it is at equal distance from previous prime (18986249) and next prime (18986251).

It is a junction number, because it is equal to n+sod(n) for n = 18986199 and 18986208.

It is not an unprimeable number, because it can be changed into a prime (18986251) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 228709 + ... + 228791.

Almost surely, 2^18986250 is an apocalyptic number.

18986250 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 18986250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24404688).

18986250 is an abundant number, since it is smaller than the sum of its proper divisors (29823126).

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

18986250 is an equidigital number, since it uses as much as digits as its factorization.

18986250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 18986250 is about 4357.3214249123. The cubic root of 18986250 is about 266.7757800002.

The spelling of 18986250 in words is "eighteen million, nine hundred eighty-six thousand, two hundred fifty".