13905381 has 16 divisors (see below), whose sum is σ = 21507584. Its totient is φ = 7826544.

The previous prime is 13905379. The next prime is 13905401. The reversal of 13905381 is 18350931.

It is a happy number.

It is not a de Polignac number, because 13905381 - 2¹ = 13905379 is a prime.

It is a super-2 number, since 2×13905381² = 386719241510322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13905301) 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, 3535 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (1344224).

Almost surely, 2^13905381 is an apocalyptic number.

It is an amenable number.

13905381 is a deficient number, since it is larger than the sum of its proper divisors (7602203).

13905381 is an equidigital number, since it uses as much as digits as its factorization.

13905381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 13905381 is about 3728.9919549390. The cubic root of 13905381 is about 240.4700337114.

The spelling of 13905381 in words is "thirteen million, nine hundred five thousand, three hundred eighty-one".