12981896 has 16 divisors (see below), whose sum is σ = 24615900. Its totient is φ = 6417664.

The previous prime is 12981893. The next prime is 12981911. The reversal of 12981896 is 69818921.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 122500 = 3586^2 + 350^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12981893) 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, 8405 + ... + 9828.

Almost surely, 2^12981896 is an apocalyptic number.

It is an amenable number.

12981896 is a deficient number, since it is larger than the sum of its proper divisors (11634004).

12981896 is a wasteful number, since it uses less digits than its factorization.

12981896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18328 (or 18324 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 12981896 is about 3603.0398277010. The cubic root of 12981896 is about 235.0242679028.

It can be divided in two parts, 129818 and 96, that multiplied together give a triangular number (12462528 = T₄₉₉₂).

The spelling of 12981896 in words is "twelve million, nine hundred eighty-one thousand, eight hundred ninety-six".