18697965 has 64 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 7983360.

The previous prime is 18697961. The next prime is 18697967. The reversal of 18697965 is 56979681.

It is not a de Polignac number, because 18697965 - 2² = 18697961 is a prime.

It is a super-2 number, since 2×18697965² = 699227790282450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18697961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49146 + ... + 49524.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^18697965 is an apocalyptic number.

18697965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18697965 is a deficient number, since it is larger than the sum of its proper divisors (18073875).

18697965 is a wasteful number, since it uses less digits than its factorization.

18697965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434.

The product of its digits is 816480, while the sum is 51.

The square root of 18697965 is about 4324.1143601898. The cubic root of 18697965 is about 265.4186570973.

The spelling of 18697965 in words is "eighteen million, six hundred ninety-seven thousand, nine hundred sixty-five".