12436981 has 4 divisors (see below), whose sum is σ = 12740364. Its totient is φ = 12133600.

The previous prime is 12436967. The next prime is 12436987. The reversal of 12436981 is 18963421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6937956 + 5499025 = 2634^2 + 2345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12436981 is a prime.

It is a super-2 number, since 2×12436981² = 309356992788722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12436987) 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, 151630 + ... + 151711.

It is an arithmetic number, because the mean of its divisors is an integer number (3185091).

Almost surely, 2^12436981 is an apocalyptic number.

It is an amenable number.

12436981 is a deficient number, since it is larger than the sum of its proper divisors (303383).

12436981 is an equidigital number, since it uses as much as digits as its factorization.

12436981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303382.

The product of its digits is 10368, while the sum is 34.

The square root of 12436981 is about 3526.6104122798. The cubic root of 12436981 is about 231.6887733736.

The spelling of 12436981 in words is "twelve million, four hundred thirty-six thousand, nine hundred eighty-one".