12721487 has 4 divisors (see below), whose sum is σ = 12730536. Its totient is φ = 12712440.

The previous prime is 12721477. The next prime is 12721519. The reversal of 12721487 is 78412721.

It is a happy number.

12721487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12721487 - 2²⁰ = 11672911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721417) 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, 1913 + ... + 5394.

It is an arithmetic number, because the mean of its divisors is an integer number (3182634).

Almost surely, 2^12721487 is an apocalyptic number.

12721487 is a deficient number, since it is larger than the sum of its proper divisors (9049).

12721487 is an equidigital number, since it uses as much as digits as its factorization.

12721487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9048.

The product of its digits is 6272, while the sum is 32.

The square root of 12721487 is about 3566.7193609815. The cubic root of 12721487 is about 233.4421598930.

The spelling of 12721487 in words is "twelve million, seven hundred twenty-one thousand, four hundred eighty-seven".