12507891 has 12 divisors (see below), whose sum is σ = 18331656. Its totient is φ = 7580320.

The previous prime is 12507889. The next prime is 12507907. The reversal of 12507891 is 19870521.

It is not a de Polignac number, because 12507891 - 2¹ = 12507889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (12507821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16866 + ... + 17591.

It is an arithmetic number, because the mean of its divisors is an integer number (1527638).

Almost surely, 2^12507891 is an apocalyptic number.

12507891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12507891 is a deficient number, since it is larger than the sum of its proper divisors (5823765).

12507891 is a wasteful number, since it uses less digits than its factorization.

12507891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34482 (or 34471 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 12507891 is about 3536.6496857902. The cubic root of 12507891 is about 232.1282671112.

The spelling of 12507891 in words is "twelve million, five hundred seven thousand, eight hundred ninety-one".