18888916 has 6 divisors (see below), whose sum is σ = 33055610. Its totient is φ = 9444456.

The previous prime is 18888913. The next prime is 18888941. The reversal of 18888916 is 61988881.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 3048516 = 3980^2 + 1746^2 .

It is a super-2 number, since 2×18888916² = 713582295310112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18888916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18888913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2361111 + ... + 2361118.

Almost surely, 2^18888916 is an apocalyptic number.

It is an amenable number.

18888916 is a deficient number, since it is larger than the sum of its proper divisors (14166694).

18888916 is a wasteful number, since it uses less digits than its factorization.

18888916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722233 (or 4722231 counting only the distinct ones).

The product of its digits is 221184, while the sum is 49.

The square root of 18888916 is about 4346.1380557916. The cubic root of 18888916 is about 266.3191187638.

The spelling of 18888916 in words is "eighteen million, eight hundred eighty-eight thousand, nine hundred sixteen".