18966697 has 8 divisors (see below), whose sum is σ = 19858176. Its totient is φ = 18080832.

The previous prime is 18966643. The next prime is 18966707. The reversal of 18966697 is 79666981.

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 18966697 - 2¹⁹ = 18442409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18966197) 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, 6528 + ... + 8974.

It is an arithmetic number, because the mean of its divisors is an integer number (2482272).

Almost surely, 2^18966697 is an apocalyptic number.

It is an amenable number.

18966697 is a deficient number, since it is larger than the sum of its proper divisors (891479).

18966697 is a wasteful number, since it uses less digits than its factorization.

18966697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807.

The product of its digits is 979776, while the sum is 52.

The square root of 18966697 is about 4355.0771520146. The cubic root of 18966697 is about 266.6841688165.

It can be divided in two parts, 1 and 8966697, that added together give a palindrome (8966698).

The spelling of 18966697 in words is "eighteen million, nine hundred sixty-six thousand, six hundred ninety-seven".