13981938 has 32 divisors (see below), whose sum is σ = 28753920. Its totient is φ = 4530960.

The previous prime is 13981937. The next prime is 13981951. The reversal of 13981938 is 83918931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 13981938.

It is not an unprimeable number, because it can be changed into a prime (13981937) 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, 44803 + ... + 45113.

It is an arithmetic number, because the mean of its divisors is an integer number (898560).

Almost surely, 2^13981938 is an apocalyptic number.

13981938 is an abundant number, since it is smaller than the sum of its proper divisors (14771982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13981938 is a wasteful number, since it uses less digits than its factorization.

13981938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502.

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

The square root of 13981938 is about 3739.2429715117. The cubic root of 13981938 is about 240.9105342179.

The spelling of 13981938 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred thirty-eight".