18663040 has 96 divisors (see below), whose sum is σ = 49244580. Its totient is φ = 6758400.

The previous prime is 18663019. The next prime is 18663103. The reversal of 18663040 is 4036681.

It can be written as a sum of positive squares in 2 ways, for example, as 18593344 + 69696 = 4312^2 + 264^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77320 + ... + 77560.

Almost surely, 2^18663040 is an apocalyptic number.

18663040 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 18663040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24622290).

18663040 is an abundant number, since it is smaller than the sum of its proper divisors (30581540).

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

18663040 is a wasteful number, since it uses less digits than its factorization.

18663040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 18663040 is about 4320.0740734390. The cubic root of 18663040 is about 265.2532999921.

The spelling of 18663040 in words is "eighteen million, six hundred sixty-three thousand, forty".