18561040 has 20 divisors (see below), whose sum is σ = 43154604. Its totient is φ = 7424384.

The previous prime is 18561029. The next prime is 18561083. The reversal of 18561040 is 4016581.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 7907344 = 3264^2 + 2812^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18560996 and 18561014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115927 + ... + 116086.

Almost surely, 2^18561040 is an apocalyptic number.

18561040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18561040 is an abundant number, since it is smaller than the sum of its proper divisors (24593564).

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

18561040 is a wasteful number, since it uses less digits than its factorization.

18561040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232026 (or 232020 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 18561040 is about 4308.2525459866. The cubic root of 18561040 is about 264.7691831377.

The spelling of 18561040 in words is "eighteen million, five hundred sixty-one thousand, forty".