18804240 has 360 divisors, whose sum is σ = 81041688. Its totient is φ = 3870720.

The previous prime is 18804229. The next prime is 18804283. The reversal of 18804240 is 4240881.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 18352656 = 672^2 + 4284^2 .

It is a tau number, because it is divible by the number of its divisors (360).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 458620 + ... + 458660.

Almost surely, 2^18804240 is an apocalyptic number.

18804240 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 18804240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40520844).

18804240 is an abundant number, since it is smaller than the sum of its proper divisors (62237448).

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

18804240 is a wasteful number, since it uses less digits than its factorization.

18804240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18804240 is about 4336.3855917111. The cubic root of 18804240 is about 265.9205672333.

It can be divided in two parts, 18804 and 240, that added together give a square (19044 = 138²).

The spelling of 18804240 in words is "eighteen million, eight hundred four thousand, two hundred forty".