12781967 has 4 divisors (see below), whose sum is σ = 13943976. Its totient is φ = 11619960.

The previous prime is 12781939. The next prime is 12782009. The reversal of 12781967 is 76918721.

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

It is not a de Polignac number, because 12781967 - 2⁶ = 12781903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781907) 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, 580988 + ... + 581009.

It is an arithmetic number, because the mean of its divisors is an integer number (3485994).

Almost surely, 2^12781967 is an apocalyptic number.

12781967 is a deficient number, since it is larger than the sum of its proper divisors (1162009).

12781967 is a wasteful number, since it uses less digits than its factorization.

12781967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162008.

The product of its digits is 42336, while the sum is 41.

The square root of 12781967 is about 3575.1876873809. The cubic root of 12781967 is about 233.8115157378.

The spelling of 12781967 in words is "twelve million, seven hundred eighty-one thousand, nine hundred sixty-seven".