18159849 has 8 divisors (see below), whose sum is σ = 26903520. Its totient is φ = 12106548.

The previous prime is 18159833. The next prime is 18159851. The reversal of 18159849 is 94895181.

18159849 is a `hidden beast` number, since 18 + 1 + 598 + 49 = 666.

It is not a de Polignac number, because 18159849 - 2⁴ = 18159833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18159049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336267 + ... + 336320.

It is an arithmetic number, because the mean of its divisors is an integer number (3362940).

Almost surely, 2^18159849 is an apocalyptic number.

It is an amenable number.

18159849 is a deficient number, since it is larger than the sum of its proper divisors (8743671).

18159849 is an equidigital number, since it uses as much as digits as its factorization.

18159849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672596 (or 672590 counting only the distinct ones).

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

The square root of 18159849 is about 4261.4374335428. The cubic root of 18159849 is about 262.8476373684.

It can be divided in two parts, 1815 and 9849, that added together give a square (11664 = 108²).

The spelling of 18159849 in words is "eighteen million, one hundred fifty-nine thousand, eight hundred forty-nine".