13943869 has 2 divisors, whose sum is σ = 13943870. Its totient is φ = 13943868.

The previous prime is 13943863. The next prime is 13943873. The reversal of 13943869 is 96834931.

13943869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 438244 = 3675^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 13943869 - 2⁹ = 13943357 is a prime.

It is a super-3 number, since 3×13943869³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13943863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6971934 + 6971935.

It is an arithmetic number, because the mean of its divisors is an integer number (6971935).

Almost surely, 2^13943869 is an apocalyptic number.

It is an amenable number.

13943869 is a deficient number, since it is larger than the sum of its proper divisors (1).

13943869 is an equidigital number, since it uses as much as digits as its factorization.

13943869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 13943869 is about 3734.1490329123. The cubic root of 13943869 is about 240.6916909427.

The spelling of 13943869 in words is "thirteen million, nine hundred forty-three thousand, eight hundred sixty-nine".