13903638 has 64 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 3687552.

The previous prime is 13903621. The next prime is 13903651. The reversal of 13903638 is 83630931.

It is a super-2 number, since 2×13903638² = 386622299270088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13903599 and 13903608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35548 + ... + 35936.

It is an arithmetic number, because the mean of its divisors is an integer number (533520).

Almost surely, 2^13903638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13903638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17072640).

13903638 is an abundant number, since it is smaller than the sum of its proper divisors (20241642).

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

13903638 is a wasteful number, since it uses less digits than its factorization.

13903638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 13903638 is about 3728.7582383416. The cubic root of 13903638 is about 240.4599858798.

It can be divided in two parts, 13903 and 638, that added together give a palindrome (14541).

The spelling of 13903638 in words is "thirteen million, nine hundred three thousand, six hundred thirty-eight".