12891646 has 4 divisors (see below), whose sum is σ = 19337472. Its totient is φ = 6445822.

The previous prime is 12891623. The next prime is 12891647. The reversal of 12891646 is 64619821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222910 + ... + 3222913.

It is an arithmetic number, because the mean of its divisors is an integer number (4834368).

Almost surely, 2^12891646 is an apocalyptic number.

12891646 is a deficient number, since it is larger than the sum of its proper divisors (6445826).

12891646 is an equidigital number, since it uses as much as digits as its factorization.

12891646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445825.

The product of its digits is 20736, while the sum is 37.

The square root of 12891646 is about 3590.4938379003. The cubic root of 12891646 is about 234.4783722020.

The spelling of 12891646 in words is "twelve million, eight hundred ninety-one thousand, six hundred forty-six".