12721507 has 16 divisors (see below), whose sum is σ = 14319360. Its totient is φ = 11243232.

The previous prime is 12721477. The next prime is 12721519. The reversal of 12721507 is 70512721.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12721507 - 2¹¹ = 12719459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18453 + ... + 19129.

It is an arithmetic number, because the mean of its divisors is an integer number (894960).

Almost surely, 2^12721507 is an apocalyptic number.

12721507 is a deficient number, since it is larger than the sum of its proper divisors (1597853).

12721507 is a wasteful number, since it uses less digits than its factorization.

12721507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 12721507 is about 3566.7221646773. The cubic root of 12721507 is about 233.4422822278.

The spelling of 12721507 in words is "twelve million, seven hundred twenty-one thousand, five hundred seven".