12728491 has 8 divisors (see below), whose sum is σ = 13096944. Its totient is φ = 12362880.

The previous prime is 12728479. The next prime is 12728503. The reversal of 12728491 is 19482721.

It is an interprime number because it is at equal distance from previous prime (12728479) and next prime (12728503).

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

It is a cyclic number.

It is not a de Polignac number, because 12728491 - 2⁷ = 12728363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12725491) 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 7 ways as a sum of consecutive naturals, for example, 11055 + ... + 12151.

It is an arithmetic number, because the mean of its divisors is an integer number (1637118).

Almost surely, 2^12728491 is an apocalyptic number.

12728491 is a deficient number, since it is larger than the sum of its proper divisors (368453).

12728491 is a wasteful number, since it uses less digits than its factorization.

With its successor (12728492) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1421).

12728491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 8064, while the sum is 34.

The square root of 12728491 is about 3567.7010805279. The cubic root of 12728491 is about 233.4849936938.

The spelling of 12728491 in words is "twelve million, seven hundred twenty-eight thousand, four hundred ninety-one".