18978750 has 120 divisors (see below), whose sum is σ = 58968624. Its totient is φ = 4320000.

The previous prime is 18978733. The next prime is 18978761. The reversal of 18978750 is 5787981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 18978696 and 18978705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 78630 + ... + 78870.

Almost surely, 2^18978750 is an apocalyptic number.

18978750 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 18978750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29484312).

18978750 is an abundant number, since it is smaller than the sum of its proper divisors (39989874).

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

18978750 is a wasteful number, since it uses less digits than its factorization.

18978750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18978750 is about 4356.4607194373. The cubic root of 18978750 is about 266.7406478763.

The spelling of 18978750 in words is "eighteen million, nine hundred seventy-eight thousand, seven hundred fifty".