12913889 has 4 divisors (see below), whose sum is σ = 13214256. Its totient is φ = 12613524.

The previous prime is 12913877. The next prime is 12913907. The reversal of 12913889 is 98831921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98831921 = 37 ⋅2671133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12913889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12913819) 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, 150119 + ... + 150204.

It is an arithmetic number, because the mean of its divisors is an integer number (3303564).

Almost surely, 2^12913889 is an apocalyptic number.

It is an amenable number.

12913889 is a deficient number, since it is larger than the sum of its proper divisors (300367).

12913889 is an equidigital number, since it uses as much as digits as its factorization.

12913889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300366.

The product of its digits is 31104, while the sum is 41.

The square root of 12913889 is about 3593.5899877421. The cubic root of 12913889 is about 234.6131495539.

The spelling of 12913889 in words is "twelve million, nine hundred thirteen thousand, eight hundred eighty-nine".