13870981 has 4 divisors (see below), whose sum is σ = 14318464. Its totient is φ = 13423500.

The previous prime is 13870979. The next prime is 13871023. The reversal of 13870981 is 18907831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13870981 - 2¹ = 13870979 is a prime.

It is a super-2 number, since 2×13870981² = 384808227804722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13870981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13870921) 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 3 ways as a sum of consecutive naturals, for example, 223695 + ... + 223756.

It is an arithmetic number, because the mean of its divisors is an integer number (3579616).

Almost surely, 2^13870981 is an apocalyptic number.

It is an amenable number.

13870981 is a deficient number, since it is larger than the sum of its proper divisors (447483).

13870981 is an equidigital number, since it uses as much as digits as its factorization.

13870981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447482.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 13870981 is about 3724.3765921292. The cubic root of 13870981 is about 240.2715733707.

The spelling of 13870981 in words is "thirteen million, eight hundred seventy thousand, nine hundred eighty-one".