12815869 has 4 divisors (see below), whose sum is σ = 13980960. Its totient is φ = 11650780.

The previous prime is 12815867. The next prime is 12815923. The reversal of 12815869 is 96851821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12815869 - 2¹ = 12815867 is a prime.

It is a super-2 number, since 2×12815869² = 328492996450322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582529 + ... + 582550.

It is an arithmetic number, because the mean of its divisors is an integer number (3495240).

Almost surely, 2^12815869 is an apocalyptic number.

It is an amenable number.

12815869 is a deficient number, since it is larger than the sum of its proper divisors (1165091).

12815869 is a wasteful number, since it uses less digits than its factorization.

12815869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165090.

The product of its digits is 34560, while the sum is 40.

The square root of 12815869 is about 3579.9258372207. The cubic root of 12815869 is about 234.0180483802.

The spelling of 12815869 in words is "twelve million, eight hundred fifteen thousand, eight hundred sixty-nine".