12891508 has 72 divisors (see below), whose sum is σ = 28699272. Its totient is φ = 5031936.

The previous prime is 12891497. The next prime is 12891509. The reversal of 12891508 is 80519821.

12891508 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5207524 + 7683984 = 2282^2 + 2772^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891509) 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, 176560 + ... + 176632.

It is an arithmetic number, because the mean of its divisors is an integer number (398601).

Almost surely, 2^12891508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12891508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14349636).

12891508 is an abundant number, since it is smaller than the sum of its proper divisors (15807764).

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

12891508 is a wasteful number, since it uses less digits than its factorization.

12891508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 12891508 is about 3590.4746204367. The cubic root of 12891508 is about 234.4775355327.

The spelling of 12891508 in words is "twelve million, eight hundred ninety-one thousand, five hundred eight".