18242861 has 16 divisors (see below), whose sum is σ = 22560384. Its totient is φ = 14364864.

The previous prime is 18242857. The next prime is 18242863. The reversal of 18242861 is 16824281.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18242861 - 2² = 18242857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242863) 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 15 ways as a sum of consecutive naturals, for example, 27611 + ... + 28263.

It is an arithmetic number, because the mean of its divisors is an integer number (1410024).

Almost surely, 2^18242861 is an apocalyptic number.

It is an amenable number.

18242861 is a deficient number, since it is larger than the sum of its proper divisors (4317523).

18242861 is a wasteful number, since it uses less digits than its factorization.

18242861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its digits is 6144, while the sum is 32.

The square root of 18242861 is about 4271.1662341801. The cubic root of 18242861 is about 263.2475368987.

The spelling of 18242861 in words is "eighteen million, two hundred forty-two thousand, eight hundred sixty-one".