18159436 has 6 divisors (see below), whose sum is σ = 31779020. Its totient is φ = 9079716.

The previous prime is 18159431. The next prime is 18159461. The reversal of 18159436 is 63495181.

It is a junction number, because it is equal to n+sod(n) for n = 18159395 and 18159404.

It is not an unprimeable number, because it can be changed into a prime (18159431) 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 as a sum of consecutive naturals, namely, 2269926 + ... + 2269933.

Almost surely, 2^18159436 is an apocalyptic number.

It is an amenable number.

18159436 is a deficient number, since it is larger than the sum of its proper divisors (13619584).

18159436 is a wasteful number, since it uses less digits than its factorization.

18159436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539863 (or 4539861 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 18159436 is about 4261.3889754398. The cubic root of 18159436 is about 262.8456447509.

The spelling of 18159436 in words is "eighteen million, one hundred fifty-nine thousand, four hundred thirty-six".