12815889 has 4 divisors (see below), whose sum is σ = 17087856. Its totient is φ = 8543924.

The previous prime is 12815867. The next prime is 12815923. The reversal of 12815889 is 98851821.

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 12815889 - 2⁵ = 12815857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12815889.

It is not an unprimeable number, because it can be changed into a prime (12815839) 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, 2135979 + ... + 2135984.

It is an arithmetic number, because the mean of its divisors is an integer number (4271964).

Almost surely, 2^12815889 is an apocalyptic number.

It is an amenable number.

12815889 is a deficient number, since it is larger than the sum of its proper divisors (4271967).

12815889 is an equidigital number, since it uses as much as digits as its factorization.

12815889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271966.

The product of its digits is 46080, while the sum is 42.

The square root of 12815889 is about 3579.9286305735. The cubic root of 12815889 is about 234.0181701136.

The spelling of 12815889 in words is "twelve million, eight hundred fifteen thousand, eight hundred eighty-nine".