18697944 has 16 divisors (see below), whose sum is σ = 46744920. Its totient is φ = 6232640.

The previous prime is 18697907. The next prime is 18697949. The reversal of 18697944 is 44979681.

It is a super-2 number, since 2×18697944² = 699226219654272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18697893 and 18697902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18697949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389517 + ... + 389564.

Almost surely, 2^18697944 is an apocalyptic number.

It is an amenable number.

18697944 is an abundant number, since it is smaller than the sum of its proper divisors (28046976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18697944 is a wasteful number, since it uses less digits than its factorization.

18697944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779090 (or 779086 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 18697944 is about 4324.1119319463. Note that the first 3 decimals coincide. The cubic root of 18697944 is about 265.4185577319.

The spelling of 18697944 in words is "eighteen million, six hundred ninety-seven thousand, nine hundred forty-four".