126403866 has 48 divisors (see below), whose sum is σ = 286191360. Its totient is φ = 40269600.

The previous prime is 126403841. The next prime is 126403867. The reversal of 126403866 is 668304621.

126403866 is a `hidden beast` number, since 1 + 2 + 640 + 3 + 8 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 126403866.

It is not an unprimeable number, because it can be changed into a prime (126403867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52591 + ... + 54941.

It is an arithmetic number, because the mean of its divisors is an integer number (5962320).

Almost surely, 2^126403866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126403866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143095680).

126403866 is an abundant number, since it is smaller than the sum of its proper divisors (159787494).

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

126403866 is a wasteful number, since it uses less digits than its factorization.

126403866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491 (or 2488 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 126403866 is about 11242.9473893637. The cubic root of 126403866 is about 501.8648573006.

The spelling of 126403866 in words is "one hundred twenty-six million, four hundred three thousand, eight hundred sixty-six".