12897815 has 32 divisors (see below), whose sum is σ = 19128960. Its totient is φ = 8146944.

The previous prime is 12897811. The next prime is 12897817. The reversal of 12897815 is 51879821.

12897815 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 12897815 - 2² = 12897811 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31331 + ... + 31739.

It is an arithmetic number, because the mean of its divisors is an integer number (597780).

Almost surely, 2^12897815 is an apocalyptic number.

12897815 is a deficient number, since it is larger than the sum of its proper divisors (6231145).

12897815 is a wasteful number, since it uses less digits than its factorization.

12897815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its digits is 40320, while the sum is 41.

The square root of 12897815 is about 3591.3528091793. The cubic root of 12897815 is about 234.5157676442.

The spelling of 12897815 in words is "twelve million, eight hundred ninety-seven thousand, eight hundred fifteen".