18897786 has 80 divisors (see below), whose sum is σ = 45163008. Its totient is φ = 5896800.

The previous prime is 18897779. The next prime is 18897797. The reversal of 18897786 is 68779881.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 266131 + ... + 266201.

Almost surely, 2^18897786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18897786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22581504).

18897786 is an abundant number, since it is smaller than the sum of its proper divisors (26265222).

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

18897786 is a wasteful number, since it uses less digits than its factorization.

18897786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 160 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 18897786 is about 4347.1583822079. The cubic root of 18897786 is about 266.3607989554.

It can be divided in two parts, 18897 and 786, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18897786 in words is "eighteen million, eight hundred ninety-seven thousand, seven hundred eighty-six".