13983981 has 16 divisors (see below), whose sum is σ = 21411840. Its totient is φ = 8028720.

The previous prime is 13983971. The next prime is 13984021. The reversal of 13983981 is 18938931.

It is a happy number.

It is not a de Polignac number, because 13983981 - 2⁶ = 13983917 is a prime.

It is a super-2 number, since 2×13983981² = 391103449216722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13983941) 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 15 ways as a sum of consecutive naturals, for example, 10525 + ... + 11778.

It is an arithmetic number, because the mean of its divisors is an integer number (1338240).

Almost surely, 2^13983981 is an apocalyptic number.

13983981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13983981 is a deficient number, since it is larger than the sum of its proper divisors (7427859).

13983981 is a wasteful number, since it uses less digits than its factorization.

13983981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22336.

The product of its digits is 46656, while the sum is 42.

The square root of 13983981 is about 3739.5161451717. The cubic root of 13983981 is about 240.9222673613.

The spelling of 13983981 in words is "thirteen million, nine hundred eighty-three thousand, nine hundred eighty-one".