18974159 has 8 divisors (see below), whose sum is σ = 20470320. Its totient is φ = 17520256.

The previous prime is 18974147. The next prime is 18974173. The reversal of 18974159 is 95147981.

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 18974159 - 2¹⁶ = 18908623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18974119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9629 + ... + 11430.

It is an arithmetic number, because the mean of its divisors is an integer number (2558790).

Almost surely, 2^18974159 is an apocalyptic number.

18974159 is a deficient number, since it is larger than the sum of its proper divisors (1496161).

18974159 is a wasteful number, since it uses less digits than its factorization.

18974159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21129.

The product of its digits is 90720, while the sum is 44.

The square root of 18974159 is about 4355.9337690098. The cubic root of 18974159 is about 266.7191377650.

The spelling of 18974159 in words is "eighteen million, nine hundred seventy-four thousand, one hundred fifty-nine".