18849561 has 8 divisors (see below), whose sum is σ = 25278720. Its totient is φ = 12493392.

The previous prime is 18849559. The next prime is 18849601. The reversal of 18849561 is 16594881.

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

It is not a de Polignac number, because 18849561 - 2¹ = 18849559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18849511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17641 + ... + 18678.

It is an arithmetic number, because the mean of its divisors is an integer number (3159840).

Almost surely, 2^18849561 is an apocalyptic number.

It is an amenable number.

18849561 is a deficient number, since it is larger than the sum of its proper divisors (6429159).

18849561 is a wasteful number, since it uses less digits than its factorization.

18849561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36495.

The product of its digits is 69120, while the sum is 42.

The square root of 18849561 is about 4341.6081122091. The cubic root of 18849561 is about 266.1340317990.

The spelling of 18849561 in words is "eighteen million, eight hundred forty-nine thousand, five hundred sixty-one".