18786416 has 40 divisors (see below), whose sum is σ = 40001904. Its totient is φ = 8476160.

The previous prime is 18786413. The next prime is 18786431. The reversal of 18786416 is 61468781.

It is a super-2 number, since 2×18786416² = 705858852250112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18786413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30140 + ... + 30756.

Almost surely, 2^18786416 is an apocalyptic number.

18786416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18786416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20000952).

18786416 is an abundant number, since it is smaller than the sum of its proper divisors (21215488).

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

18786416 is a wasteful number, since it uses less digits than its factorization.

18786416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 803 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 18786416 is about 4334.3299366799. The cubic root of 18786416 is about 265.8365211787.

The spelling of 18786416 in words is "eighteen million, seven hundred eighty-six thousand, four hundred sixteen".