12887421 has 8 divisors (see below), whose sum is σ = 17209440. Its totient is φ = 8578512.

The previous prime is 12887417. The next prime is 12887437. The reversal of 12887421 is 12478821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12887421 - 2² = 12887417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12887461) 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 7 ways as a sum of consecutive naturals, for example, 690 + ... + 5123.

It is an arithmetic number, because the mean of its divisors is an integer number (2151180).

Almost surely, 2^12887421 is an apocalyptic number.

It is an amenable number.

12887421 is a deficient number, since it is larger than the sum of its proper divisors (4322019).

12887421 is an equidigital number, since it uses as much as digits as its factorization.

12887421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6555.

The product of its digits is 7168, while the sum is 33.

The square root of 12887421 is about 3589.9054305093. The cubic root of 12887421 is about 234.4527540777.

The spelling of 12887421 in words is "twelve million, eight hundred eighty-seven thousand, four hundred twenty-one".