18158159 has 12 divisors (see below), whose sum is σ = 19547304. Its totient is φ = 16861824.

The previous prime is 18158137. The next prime is 18158191. The reversal of 18158159 is 95185181.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18158159 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18158359) 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 11 ways as a sum of consecutive naturals, for example, 23609 + ... + 24365.

It is an arithmetic number, because the mean of its divisors is an integer number (1628942).

Almost surely, 2^18158159 is an apocalyptic number.

18158159 is a deficient number, since it is larger than the sum of its proper divisors (1389145).

18158159 is an equidigital number, since it uses as much as digits as its factorization.

18158159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 857 counting only the distinct ones).

The product of its digits is 14400, while the sum is 38.

The square root of 18158159 is about 4261.2391390299. The cubic root of 18158159 is about 262.8394833672.

The spelling of 18158159 in words is "eighteen million, one hundred fifty-eight thousand, one hundred fifty-nine".