18459861 has 32 divisors (see below), whose sum is σ = 29306880. Its totient is φ = 10117056.

The previous prime is 18459839. The next prime is 18459923. The reversal of 18459861 is 16895481.

18459861 = 53² + 54² + ... + 381².

It is not a de Polignac number, because 18459861 - 2⁵ = 18459829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18459821) 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 31 ways as a sum of consecutive naturals, for example, 58075 + ... + 58391.

It is an arithmetic number, because the mean of its divisors is an integer number (915840).

Almost surely, 2^18459861 is an apocalyptic number.

It is an amenable number.

18459861 is a deficient number, since it is larger than the sum of its proper divisors (10847019).

18459861 is a wasteful number, since it uses less digits than its factorization.

18459861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433.

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

The square root of 18459861 is about 4296.4940358390. The cubic root of 18459861 is about 264.2872075188.

The spelling of 18459861 in words is "eighteen million, four hundred fifty-nine thousand, eight hundred sixty-one".