12975781 has 8 divisors (see below), whose sum is σ = 15970304. Its totient is φ = 10266480.

The previous prime is 12975779. The next prime is 12975791. The reversal of 12975781 is 18757921.

12975781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12975781 - 2¹ = 12975779 is a prime.

It is a super-2 number, since 2×12975781² = 336741785119922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12975791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71205 + ... + 71386.

It is an arithmetic number, because the mean of its divisors is an integer number (1996288).

Almost surely, 2^12975781 is an apocalyptic number.

It is an amenable number.

12975781 is a deficient number, since it is larger than the sum of its proper divisors (2994523).

12975781 is a wasteful number, since it uses less digits than its factorization.

12975781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142611.

The product of its digits is 35280, while the sum is 40.

The square root of 12975781 is about 3602.1911387376. The cubic root of 12975781 is about 234.9873601169.

The spelling of 12975781 in words is "twelve million, nine hundred seventy-five thousand, seven hundred eighty-one".