12728937 has 32 divisors (see below), whose sum is σ = 19692288. Its totient is φ = 7243776.

The previous prime is 12728927. The next prime is 12728939. The reversal of 12728937 is 73982721.

It is a de Polignac number, because none of the positive numbers 2^k-12728937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 12728895 and 12728904.

It is not an unprimeable number, because it can be changed into a prime (12728939) 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 31 ways as a sum of consecutive naturals, for example, 48268 + ... + 48530.

It is an arithmetic number, because the mean of its divisors is an integer number (615384).

Almost surely, 2^12728937 is an apocalyptic number.

12728937 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12728937 is a deficient number, since it is larger than the sum of its proper divisors (6963351).

12728937 is a wasteful number, since it uses less digits than its factorization.

12728937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369.

The product of its digits is 42336, while the sum is 39.

The square root of 12728937 is about 3567.7635852169. The cubic root of 12728937 is about 233.4877207280.

The spelling of 12728937 in words is "twelve million, seven hundred twenty-eight thousand, nine hundred thirty-seven".