13931838 has 20 divisors (see below), whose sum is σ = 31218000. Its totient is φ = 4643892.

The previous prime is 13931837. The next prime is 13931843. The reversal of 13931838 is 83813931.

It is a super-2 number, since 2×13931838² = 388192220116488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13931837) 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 9 ways as a sum of consecutive naturals, for example, 42838 + ... + 43161.

It is an arithmetic number, because the mean of its divisors is an integer number (1560900).

Almost surely, 2^13931838 is an apocalyptic number.

13931838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13931838 is an abundant number, since it is smaller than the sum of its proper divisors (17286162).

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

13931838 is an equidigital number, since it uses as much as digits as its factorization.

13931838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86013 (or 86004 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 13931838 is about 3732.5377426089. The cubic root of 13931838 is about 240.6224467711.

The spelling of 13931838 in words is "thirteen million, nine hundred thirty-one thousand, eight hundred thirty-eight".