12781995 has 16 divisors (see below), whose sum is σ = 20634912. Its totient is φ = 6755840.

The previous prime is 12781939. The next prime is 12782009. The reversal of 12781995 is 59918721.

It is not a de Polignac number, because 12781995 - 2⁶ = 12781931 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2076 + ... + 5465.

It is an arithmetic number, because the mean of its divisors is an integer number (1289682).

Almost surely, 2^12781995 is an apocalyptic number.

12781995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12781995 is a deficient number, since it is larger than the sum of its proper divisors (7852917).

12781995 is a wasteful number, since it uses less digits than its factorization.

12781995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its digits is 45360, while the sum is 42.

The square root of 12781995 is about 3575.1916032571. The cubic root of 12781995 is about 233.8116864658.

The spelling of 12781995 in words is "twelve million, seven hundred eighty-one thousand, nine hundred ninety-five".