18689493 has 8 divisors (see below), whose sum is σ = 24964128. Its totient is φ = 12437264.

The previous prime is 18689491. The next prime is 18689509. The reversal of 18689493 is 39498681.

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 18689493 - 2¹ = 18689491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18689491) 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, 3546 + ... + 7067.

It is an arithmetic number, because the mean of its divisors is an integer number (3120516).

Almost surely, 2^18689493 is an apocalyptic number.

It is an amenable number.

18689493 is a deficient number, since it is larger than the sum of its proper divisors (6274635).

18689493 is a wasteful number, since it uses less digits than its factorization.

18689493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203.

The product of its digits is 373248, while the sum is 48.

The square root of 18689493 is about 4323.1346266338. The cubic root of 18689493 is about 265.3785642037.

The spelling of 18689493 in words is "eighteen million, six hundred eighty-nine thousand, four hundred ninety-three".