11818638 has 48 divisors (see below), whose sum is σ = 29208816. Its totient is φ = 3421440.

The previous prime is 11818607. The next prime is 11818643. The reversal of 11818638 is 83681811.

11818638 is a `hidden beast` number, since 1 + 1 + 8 + 18 + 638 = 666.

11818638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2493 + ... + 5463.

It is an arithmetic number, because the mean of its divisors is an integer number (608517).

Almost surely, 2^11818638 is an apocalyptic number.

11818638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11818638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14604408).

11818638 is an abundant number, since it is smaller than the sum of its proper divisors (17390178).

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

11818638 is a wasteful number, since it uses less digits than its factorization.

11818638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009 (or 3006 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 11818638 is about 3437.8246028557. The cubic root of 11818638 is about 227.7836127970.

The spelling of 11818638 in words is "eleven million, eight hundred eighteen thousand, six hundred thirty-eight".