13858866 has 72 divisors (see below), whose sum is σ = 36812880. Its totient is φ = 3746736.

The previous prime is 13858849. The next prime is 13858877. The reversal of 13858866 is 66885831.

13858866 is a `hidden beast` number, since 1 + 3 + 8 + 588 + 66 = 666.

13858866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16345 + ... + 17171.

It is an arithmetic number, because the mean of its divisors is an integer number (511290).

Almost surely, 2^13858866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13858866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18406440).

13858866 is an abundant number, since it is smaller than the sum of its proper divisors (22954014).

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

13858866 is a wasteful number, since it uses less digits than its factorization.

13858866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 858 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 13858866 is about 3722.7497901417. The cubic root of 13858866 is about 240.2016014395.

The spelling of 13858866 in words is "thirteen million, eight hundred fifty-eight thousand, eight hundred sixty-six".