12672781 has 4 divisors (see below), whose sum is σ = 13824864. Its totient is φ = 11520700.

The previous prime is 12672767. The next prime is 12672817. The reversal of 12672781 is 18727621.

It is a happy number.

12672781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18727621 = 11 ⋅1702511.

It is a cyclic number.

It is not a de Polignac number, because 12672781 - 2⁵ = 12672749 is a prime.

It is a super-2 number, since 2×12672781² = 321198756547922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12672721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576025 + ... + 576046.

It is an arithmetic number, because the mean of its divisors is an integer number (3456216).

Almost surely, 2^12672781 is an apocalyptic number.

12672781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12672781 is a deficient number, since it is larger than the sum of its proper divisors (1152083).

12672781 is a wasteful number, since it uses less digits than its factorization.

12672781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152082.

The product of its digits is 9408, while the sum is 34.

The square root of 12672781 is about 3559.8849700517. The cubic root of 12672781 is about 233.1438568363.

The spelling of 12672781 in words is "twelve million, six hundred seventy-two thousand, seven hundred eighty-one".