18561842 has 8 divisors (see below), whose sum is σ = 29984556. Its totient is φ = 8566992.

The previous prime is 18561833. The next prime is 18561847. The reversal of 18561842 is 24816581.

It can be written as a sum of positive squares in 2 ways, for example, as 16900321 + 1661521 = 4111^2 + 1289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18561847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356933 + ... + 356984.

Almost surely, 2^18561842 is an apocalyptic number.

18561842 is a deficient number, since it is larger than the sum of its proper divisors (11422714).

18561842 is a wasteful number, since it uses less digits than its factorization.

18561842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713932.

The product of its digits is 15360, while the sum is 35.

The square root of 18561842 is about 4308.3456221617. The cubic root of 18561842 is about 264.7729965344.

The spelling of 18561842 in words is "eighteen million, five hundred sixty-one thousand, eight hundred forty-two".