18679687 has 4 divisors (see below), whose sum is σ = 20116600. Its totient is φ = 17242776.

The previous prime is 18679663. The next prime is 18679693. The reversal of 18679687 is 78697681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18679687 - 2¹¹ = 18677639 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 (18679627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718437 + ... + 718462.

It is an arithmetic number, because the mean of its divisors is an integer number (5029150).

Almost surely, 2^18679687 is an apocalyptic number.

18679687 is a deficient number, since it is larger than the sum of its proper divisors (1436913).

18679687 is a wasteful number, since it uses less digits than its factorization.

18679687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436912.

The product of its digits is 1016064, while the sum is 52.

The square root of 18679687 is about 4322.0003470615. Note that the first 3 decimals coincide. The cubic root of 18679687 is about 265.3321431574.

The spelling of 18679687 in words is "eighteen million, six hundred seventy-nine thousand, six hundred eighty-seven".