18960561 has 28 divisors (see below), whose sum is σ = 29379840. Its totient is φ = 12218040.

The previous prime is 18960551. The next prime is 18960563. The reversal of 18960561 is 16506981.

18960561 is a `hidden beast` number, since 1 + 8 + 96 + 0 + 561 = 666.

It is not a de Polignac number, because 18960561 - 2⁷ = 18960433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18960563) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 22180 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (1049280).

Almost surely, 2^18960561 is an apocalyptic number.

It is an amenable number.

18960561 is a deficient number, since it is larger than the sum of its proper divisors (10419279).

18960561 is an frugal number, since it uses more digits than its factorization.

18960561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18960561 is about 4354.3726298974. The cubic root of 18960561 is about 266.6554069899.

The spelling of 18960561 in words is "eighteen million, nine hundred sixty thousand, five hundred sixty-one".