18522240 has 128 divisors (see below), whose sum is σ = 64480320. Its totient is φ = 4485120.

The previous prime is 18522239. The next prime is 18522241. The reversal of 18522240 is 4222581.

It is an interprime number because it is at equal distance from previous prime (18522239) and next prime (18522241).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18522240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18522241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20682 + ... + 21558.

Almost surely, 2^18522240 is an apocalyptic number.

18522240 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 18522240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32240160).

18522240 is an abundant number, since it is smaller than the sum of its proper divisors (45958080).

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

18522240 is a wasteful number, since it uses less digits than its factorization.

18522240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 18522240 is about 4303.7472044719. The cubic root of 18522240 is about 264.5845632585.

The spelling of 18522240 in words is "eighteen million, five hundred twenty-two thousand, two hundred forty".