18324840 has 64 divisors (see below), whose sum is σ = 55699200. Its totient is φ = 4822272.

The previous prime is 18324829. The next prime is 18324851. The reversal of 18324840 is 4842381.

It is an interprime number because it is at equal distance from previous prime (18324829) and next prime (18324851).

It is a super-2 number, since 2×18324840² = 671599522051200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18324798 and 18324807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8514 + ... + 10446.

It is an arithmetic number, because the mean of its divisors is an integer number (870300).

Almost surely, 2^18324840 is an apocalyptic number.

18324840 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 18324840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27849600).

18324840 is an abundant number, since it is smaller than the sum of its proper divisors (37374360).

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

18324840 is a wasteful number, since it uses less digits than its factorization.

18324840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026 (or 2022 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18324840 is about 4280.7522703375. The cubic root of 18324840 is about 263.6412712667.

The spelling of 18324840 in words is "eighteen million, three hundred twenty-four thousand, eight hundred forty".