13438381 has 24 divisors (see below), whose sum is σ = 16087680. Its totient is φ = 11172480.

The previous prime is 13438367. The next prime is 13438387. The reversal of 13438381 is 18383431.

It is not a de Polignac number, because 13438381 - 2⁵ = 13438349 is a prime.

It is a super-2 number, since 2×13438381² = 361180167802322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13438387) 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, 96610 + ... + 96748.

It is an arithmetic number, because the mean of its divisors is an integer number (670320).

Almost surely, 2^13438381 is an apocalyptic number.

13438381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13438381 is a deficient number, since it is larger than the sum of its proper divisors (2649299).

13438381 is a wasteful number, since it uses less digits than its factorization.

13438381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 214 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 13438381 is about 3665.8397400868. The cubic root of 13438381 is about 237.7473308922.

The spelling of 13438381 in words is "thirteen million, four hundred thirty-eight thousand, three hundred eighty-one".