18861560 has 16 divisors (see below), whose sum is σ = 42438600. Its totient is φ = 7544608.

The previous prime is 18861539. The next prime is 18861569. The reversal of 18861560 is 6516881.

It is a self number, because there is not a number n which added to its sum of digits gives 18861560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861569) 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, 235730 + ... + 235809.

Almost surely, 2^18861560 is an apocalyptic number.

18861560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18861560 is an abundant number, since it is smaller than the sum of its proper divisors (23577040).

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

18861560 is a wasteful number, since it uses less digits than its factorization.

18861560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471550 (or 471546 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18861560 is about 4342.9897536144. The cubic root of 18861560 is about 266.1904904948.

The spelling of 18861560 in words is "eighteen million, eight hundred sixty-one thousand, five hundred sixty".