12889487 has 4 divisors (see below), whose sum is σ = 13881000. Its totient is φ = 11897976.

The previous prime is 12889477. The next prime is 12889493. The reversal of 12889487 is 78498821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12889487 - 2⁶ = 12889423 is a prime.

It is a super-2 number, since 2×12889487² = 332277750246338, 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 (12889447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495737 + ... + 495762.

It is an arithmetic number, because the mean of its divisors is an integer number (3470250).

Almost surely, 2^12889487 is an apocalyptic number.

12889487 is a deficient number, since it is larger than the sum of its proper divisors (991513).

12889487 is an equidigital number, since it uses as much as digits as its factorization.

12889487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991512.

The product of its digits is 258048, while the sum is 47.

The square root of 12889487 is about 3590.1931702904. The cubic root of 12889487 is about 234.4652818883.

The spelling of 12889487 in words is "twelve million, eight hundred eighty-nine thousand, four hundred eighty-seven".