18548861 has 4 divisors (see below), whose sum is σ = 18673500. Its totient is φ = 18424224.

The previous prime is 18548813. The next prime is 18548869. The reversal of 18548861 is 16884581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1943236 + 16605625 = 1394^2 + 4075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18548861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18548869) 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, 62096 + ... + 62393.

It is an arithmetic number, because the mean of its divisors is an integer number (4668375).

Almost surely, 2^18548861 is an apocalyptic number.

It is an amenable number.

18548861 is a deficient number, since it is larger than the sum of its proper divisors (124639).

18548861 is a wasteful number, since it uses less digits than its factorization.

18548861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124638.

The product of its digits is 61440, while the sum is 41.

The square root of 18548861 is about 4306.8388639465. The cubic root of 18548861 is about 264.7112602083.

The spelling of 18548861 in words is "eighteen million, five hundred forty-eight thousand, eight hundred sixty-one".