18252780 has 96 divisors (see below), whose sum is σ = 62920704. Its totient is φ = 3849984.

The previous prime is 18252763. The next prime is 18252797. The reversal of 18252780 is 8725281.

It is an interprime number because it is at equal distance from previous prime (18252763) and next prime (18252797).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3789 + ... + 7131.

It is an arithmetic number, because the mean of its divisors is an integer number (655424).

Almost surely, 2^18252780 is an apocalyptic number.

18252780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18252780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31460352).

18252780 is an abundant number, since it is smaller than the sum of its proper divisors (44667924).

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

18252780 is a wasteful number, since it uses less digits than its factorization.

18252780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18252780 is about 4272.3272346579. The cubic root of 18252780 is about 263.2952391975.

Subtracting from 18252780 its product of nonzero digits (8960), we obtain a triangular number (18243820 = T₆₀₄₀).

The spelling of 18252780 in words is "eighteen million, two hundred fifty-two thousand, seven hundred eighty".