12581406 has 40 divisors (see below), whose sum is σ = 28967400. Its totient is φ = 4078512.

The previous prime is 12581357. The next prime is 12581407. The reversal of 12581406 is 60418521.

12581406 is a `hidden beast` number, since 1 + 258 + 1 + 406 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12581406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4945 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (724185).

Almost surely, 2^12581406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12581406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14483700).

12581406 is an abundant number, since it is smaller than the sum of its proper divisors (16385994).

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

12581406 is a wasteful number, since it uses less digits than its factorization.

12581406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2141 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12581406 is about 3547.0277698377. The cubic root of 12581406 is about 232.5821561896.

Adding to 12581406 its reverse (60418521), we get a palindrome (72999927).

The spelling of 12581406 in words is "twelve million, five hundred eighty-one thousand, four hundred six".