13939481 has 2 divisors, whose sum is σ = 13939482. Its totient is φ = 13939480.

The previous prime is 13939469. The next prime is 13939493. The reversal of 13939481 is 18493931.

It is a happy number.

13939481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (13939469) and next prime (13939493).

It can be written as a sum of positive squares in only one way, i.e., 8649481 + 5290000 = 2941^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 13939481 - 2¹⁸ = 13677337 is a prime.

It is a super-2 number, since 2×13939481² = 388618261098722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13939411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969740 + 6969741.

It is an arithmetic number, because the mean of its divisors is an integer number (6969741).

Almost surely, 2^13939481 is an apocalyptic number.

It is an amenable number.

13939481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13939481 is an equidigital number, since it uses as much as digits as its factorization.

13939481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 13939481 is about 3733.5614364839. The cubic root of 13939481 is about 240.6664405155. Note that the first 3 decimals are identical.

The spelling of 13939481 in words is "thirteen million, nine hundred thirty-nine thousand, four hundred eighty-one".