18485880 has 128 divisors (see below), whose sum is σ = 64627200. Its totient is φ = 4142592.

The previous prime is 18485869. The next prime is 18485881. The reversal of 18485880 is 8858481.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18485881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49374 + ... + 49746.

It is an arithmetic number, because the mean of its divisors is an integer number (504900).

Almost surely, 2^18485880 is an apocalyptic number.

18485880 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 18485880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32313600).

18485880 is an abundant number, since it is smaller than the sum of its proper divisors (46141320).

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

18485880 is a wasteful number, since it uses less digits than its factorization.

18485880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 42.

The square root of 18485880 is about 4299.5209035426. The cubic root of 18485880 is about 264.4113193345.

The spelling of 18485880 in words is "eighteen million, four hundred eighty-five thousand, eight hundred eighty".