18042880 has 52 divisors (see below), whose sum is σ = 43346772. Its totient is φ = 7208960.

The previous prime is 18042859. The next prime is 18042887. The reversal of 18042880 is 8824081.

It can be written as a sum of positive squares in 2 ways, for example, as 4734976 + 13307904 = 2176^2 + 3648^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20040 + ... + 20920.

It is a vampire number, since it can be written as 2048 ⋅ 8810 (with its own digits).

Almost surely, 2^18042880 is an apocalyptic number.

18042880 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 18042880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21673386).

18042880 is an abundant number, since it is smaller than the sum of its proper divisors (25303892).

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

18042880 is an frugal number, since it uses more digits than its factorization.

18042880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 18042880 is about 4247.6911375476. The cubic root of 18042880 is about 262.2820806670.

The spelling of 18042880 in words is "eighteen million, forty-two thousand, eight hundred eighty".