13884721 has 2 divisors, whose sum is σ = 13884722. Its totient is φ = 13884720.

The previous prime is 13884713. The next prime is 13884727. The reversal of 13884721 is 12748831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13220496 + 664225 = 3636^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 13884721 - 2³ = 13884713 is a prime.

It is not a weakly prime, because it can be changed into another prime (13884727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6942360 + 6942361.

It is an arithmetic number, because the mean of its divisors is an integer number (6942361).

Almost surely, 2^13884721 is an apocalyptic number.

It is an amenable number.

13884721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13884721 is an equidigital number, since it uses as much as digits as its factorization.

13884721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 13884721 is about 3726.2207395698. The cubic root of 13884721 is about 240.3508814352.

The spelling of 13884721 in words is "thirteen million, eight hundred eighty-four thousand, seven hundred twenty-one".