18480840 has 128 divisors (see below), whose sum is σ = 64800000. Its totient is φ = 4214784.

The previous prime is 18480829. The next prime is 18480851. The reversal of 18480840 is 4808481.

It is an interprime number because it is at equal distance from previous prime (18480829) and next prime (18480851).

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, 40936 + ... + 41384.

It is an arithmetic number, because the mean of its divisors is an integer number (506250).

Almost surely, 2^18480840 is an apocalyptic number.

18480840 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 18480840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32400000).

18480840 is an abundant number, since it is smaller than the sum of its proper divisors (46319160).

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

18480840 is a wasteful number, since it uses less digits than its factorization.

18480840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 18480840 is about 4298.9347517728. The cubic root of 18480840 is about 264.3872874035.

The spelling of 18480840 in words is "eighteen million, four hundred eighty thousand, eight hundred forty".