12942981 has 6 divisors (see below), whose sum is σ = 18695430. Its totient is φ = 8628648.

The previous prime is 12942977. The next prime is 12942983. The reversal of 12942981 is 18924921.

It can be written as a sum of positive squares in only one way, i.e., 11840481 + 1102500 = 3441^2 + 1050^2 .

It is not a de Polignac number, because 12942981 - 2² = 12942977 is a prime.

It is a super-2 number, since 2×12942981² = 335041514332722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12942983) 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 5 ways as a sum of consecutive naturals, for example, 719046 + ... + 719063.

It is an arithmetic number, because the mean of its divisors is an integer number (3115905).

Almost surely, 2^12942981 is an apocalyptic number.

It is an amenable number.

12942981 is a deficient number, since it is larger than the sum of its proper divisors (5752449).

12942981 is a wasteful number, since it uses less digits than its factorization.

12942981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438115 (or 1438112 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 12942981 is about 3597.6354734742. The cubic root of 12942981 is about 234.7891937811.

The spelling of 12942981 in words is "twelve million, nine hundred forty-two thousand, nine hundred eighty-one".