13916381 has 4 divisors (see below), whose sum is σ = 13924764. Its totient is φ = 13908000.

The previous prime is 13916363. The next prime is 13916393. The reversal of 13916381 is 18361931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18361931 = 7 ⋅2623133.

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 5331481 = 2930^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 13916381 - 2¹⁰ = 13915357 is a prime.

It is a super-2 number, since 2×13916381² = 387331320274322, 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 (13916321) 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 3 ways as a sum of consecutive naturals, for example, 770 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (3481191).

Almost surely, 2^13916381 is an apocalyptic number.

It is an amenable number.

13916381 is a deficient number, since it is larger than the sum of its proper divisors (8383).

13916381 is an equidigital number, since it uses as much as digits as its factorization.

13916381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382.

The product of its digits is 3888, while the sum is 32.

The square root of 13916381 is about 3730.4665928004. The cubic root of 13916381 is about 240.5334257940.

The spelling of 13916381 in words is "thirteen million, nine hundred sixteen thousand, three hundred eighty-one".