12772781 has 12 divisors (see below), whose sum is σ = 14916672. Its totient is φ = 10905048.

The previous prime is 12772777. The next prime is 12772801. The reversal of 12772781 is 18727721.

It is not a de Polignac number, because 12772781 - 2² = 12772777 is a prime.

It is a super-2 number, since 2×12772781² = 326287868947922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12772181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22406 + ... + 22968.

It is an arithmetic number, because the mean of its divisors is an integer number (1243056).

Almost surely, 2^12772781 is an apocalyptic number.

It is an amenable number.

12772781 is a deficient number, since it is larger than the sum of its proper divisors (2143891).

12772781 is an equidigital number, since it uses as much as digits as its factorization.

12772781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1033 counting only the distinct ones).

The product of its digits is 10976, while the sum is 35.

The square root of 12772781 is about 3573.9027686830. The cubic root of 12772781 is about 233.7554913063.

The spelling of 12772781 in words is "twelve million, seven hundred seventy-two thousand, seven hundred eighty-one".