18149859 has 64 divisors (see below), whose sum is σ = 33868800. Its totient is φ = 9351936.

The previous prime is 18149851. The next prime is 18149861. The reversal of 18149859 is 95894181.

It is not a de Polignac number, because 18149859 - 2³ = 18149851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18149851) 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 63 ways as a sum of consecutive naturals, for example, 203887 + ... + 203975.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^18149859 is an apocalyptic number.

18149859 is a deficient number, since it is larger than the sum of its proper divisors (15718941).

18149859 is a wasteful number, since it uses less digits than its factorization.

18149859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 195 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18149859 is about 4260.2651325944. The cubic root of 18149859 is about 262.7994297438.

The spelling of 18149859 in words is "eighteen million, one hundred forty-nine thousand, eight hundred fifty-nine".