12281587 has 4 divisors (see below), whose sum is σ = 12705120. Its totient is φ = 11858056.

The previous prime is 12281573. The next prime is 12281597. The reversal of 12281587 is 78518221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78518221 = 1993 ⋅39397.

It is a cyclic number.

It is not a de Polignac number, because 12281587 - 2⁷ = 12281459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12281597) 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, 211723 + ... + 211780.

It is an arithmetic number, because the mean of its divisors is an integer number (3176280).

Almost surely, 2^12281587 is an apocalyptic number.

12281587 is a deficient number, since it is larger than the sum of its proper divisors (423533).

12281587 is an equidigital number, since it uses as much as digits as its factorization.

12281587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423532.

The product of its digits is 8960, while the sum is 34.

The square root of 12281587 is about 3504.5095234569. The cubic root of 12281587 is about 230.7197803986.

The spelling of 12281587 in words is "twelve million, two hundred eighty-one thousand, five hundred eighty-seven".