13798638 has 48 divisors (see below), whose sum is σ = 34550880. Its totient is φ = 3898368.

The previous prime is 13798621. The next prime is 13798639. The reversal of 13798638 is 83689731.

It is a happy number.

13798638 is a `hidden beast` number, since 1 + 3 + 7 + 9 + 8 + 638 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13798593 and 13798602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13798639) 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 23 ways as a sum of consecutive naturals, for example, 11658 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (719810).

Almost surely, 2^13798638 is an apocalyptic number.

13798638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13798638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17275440).

13798638 is an abundant number, since it is smaller than the sum of its proper divisors (20752242).

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

13798638 is a wasteful number, since it uses less digits than its factorization.

13798638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1238 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 13798638 is about 3714.6518006403. The cubic root of 13798638 is about 239.8531393181.

The spelling of 13798638 in words is "thirteen million, seven hundred ninety-eight thousand, six hundred thirty-eight".