12720987 has 6 divisors (see below), whose sum is σ = 18374772. Its totient is φ = 8480652.

The previous prime is 12720977. The next prime is 12720997. The reversal of 12720987 is 78902721.

12720987 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12720977) and next prime (12720997).

It is not a de Polignac number, because 12720987 - 2⁴ = 12720971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12720977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 706713 + ... + 706730.

It is an arithmetic number, because the mean of its divisors is an integer number (3062462).

Almost surely, 2^12720987 is an apocalyptic number.

12720987 is a deficient number, since it is larger than the sum of its proper divisors (5653785).

12720987 is a wasteful number, since it uses less digits than its factorization.

12720987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413449 (or 1413446 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 12720987 is about 3566.6492678703. The cubic root of 12720987 is about 233.4391014820.

The spelling of 12720987 in words is "twelve million, seven hundred twenty thousand, nine hundred eighty-seven".