18252540 has 120 divisors (see below), whose sum is σ = 60374160. Its totient is φ = 4603392.

The previous prime is 18252539. The next prime is 18252541. The reversal of 18252540 is 4525281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18252539) and next prime (18252541).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18252541) 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, 30484 + ... + 31076.

It is an arithmetic number, because the mean of its divisors is an integer number (503118).

Almost surely, 2^18252540 is an apocalyptic number.

18252540 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 18252540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30187080).

18252540 is an abundant number, since it is smaller than the sum of its proper divisors (42121620).

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

18252540 is a wasteful number, since it uses less digits than its factorization.

18252540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18252540 is about 4272.2991468295. The cubic root of 18252540 is about 263.2940851973.

The spelling of 18252540 in words is "eighteen million, two hundred fifty-two thousand, five hundred forty".