12891722 has 8 divisors (see below), whose sum is σ = 19961472. Its totient is φ = 6237900.

The previous prime is 12891721. The next prime is 12891731. The reversal of 12891722 is 22719821.

It is a happy number.

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

It is a super-2 number, since 2×12891722² = 332392992250568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12891721) 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 3 ways as a sum of consecutive naturals, for example, 103904 + ... + 104027.

It is an arithmetic number, because the mean of its divisors is an integer number (2495184).

Almost surely, 2^12891722 is an apocalyptic number.

12891722 is a deficient number, since it is larger than the sum of its proper divisors (7069750).

12891722 is a wasteful number, since it uses less digits than its factorization.

12891722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207964.

The product of its digits is 4032, while the sum is 32.

The square root of 12891722 is about 3590.5044213871. The cubic root of 12891722 is about 234.4788329738.

The spelling of 12891722 in words is "twelve million, eight hundred ninety-one thousand, seven hundred twenty-two".