18689797 has 8 divisors (see below), whose sum is σ = 21560256. Its totient is φ = 15869472.

The previous prime is 18689789. The next prime is 18689813. The reversal of 18689797 is 79798681.

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 18689797 - 2³ = 18689789 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 (18689197) 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, 11728 + ... + 13225.

It is an arithmetic number, because the mean of its divisors is an integer number (2695032).

Almost surely, 2^18689797 is an apocalyptic number.

It is an amenable number.

18689797 is a deficient number, since it is larger than the sum of its proper divisors (2870459).

18689797 is a wasteful number, since it uses less digits than its factorization.

18689797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25067.

The product of its digits is 1524096, while the sum is 55.

The square root of 18689797 is about 4323.1697861639. The cubic root of 18689797 is about 265.3800030629.

The spelling of 18689797 in words is "eighteen million, six hundred eighty-nine thousand, seven hundred ninety-seven".