12861632 has 56 divisors (see below), whose sum is σ = 30723840. Its totient is φ = 5218560.

The previous prime is 12861631. The next prime is 12861637. The reversal of 12861632 is 23616821.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 12861595 and 12861604.

It is not an unprimeable number, because it can be changed into a prime (12861631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7757 + ... + 9267.

It is an arithmetic number, because the mean of its divisors is an integer number (548640).

Almost surely, 2^12861632 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 12861632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15361920).

12861632 is an abundant number, since it is smaller than the sum of its proper divisors (17862208).

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

12861632 is a wasteful number, since it uses less digits than its factorization.

12861632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549 (or 1539 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 12861632 is about 3586.3117544352. The cubic root of 12861632 is about 234.2962619540.

The spelling of 12861632 in words is "twelve million, eight hundred sixty-one thousand, six hundred thirty-two".