18159427 has 8 divisors (see below), whose sum is σ = 21334320. Its totient is φ = 15238560.

The previous prime is 18159419. The next prime is 18159431. The reversal of 18159427 is 72495181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18159427 - 2³ = 18159419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18159227) 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, 63352 + ... + 63637.

It is an arithmetic number, because the mean of its divisors is an integer number (2666790).

Almost surely, 2^18159427 is an apocalyptic number.

18159427 is a deficient number, since it is larger than the sum of its proper divisors (3174893).

18159427 is a wasteful number, since it uses less digits than its factorization.

18159427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127013.

The product of its digits is 20160, while the sum is 37.

The square root of 18159427 is about 4261.3879194460. The cubic root of 18159427 is about 262.8456013279.

The spelling of 18159427 in words is "eighteen million, one hundred fifty-nine thousand, four hundred twenty-seven".