12884391 has 36 divisors (see below), whose sum is σ = 20725848. Its totient is φ = 7705152.

The previous prime is 12884387. The next prime is 12884411. The reversal of 12884391 is 19348821.

12884391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12884391 - 2² = 12884387 is a prime.

Its product of digits (13824) is a multiple of the sum of its prime divisors (256).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12884321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65305 + ... + 65501.

It is an arithmetic number, because the mean of its divisors is an integer number (575718).

Almost surely, 2^12884391 is an apocalyptic number.

12884391 is a deficient number, since it is larger than the sum of its proper divisors (7841457).

12884391 is a wasteful number, since it uses less digits than its factorization.

12884391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 256 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 12884391 is about 3589.4833890130. The cubic root of 12884391 is about 234.4343783420.

The spelling of 12884391 in words is "twelve million, eight hundred eighty-four thousand, three hundred ninety-one".