13938561 has 80 divisors (see below), whose sum is σ = 26887168. Its totient is φ = 6998400.

The previous prime is 13938559. The next prime is 13938577. The reversal of 13938561 is 16583931.

It is a happy number.

13938561 is a `hidden beast` number, since 1 + 3 + 93 + 8 + 561 = 666.

13938561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13938561 - 2¹ = 13938559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13938511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 228471 + ... + 228531.

Almost surely, 2^13938561 is an apocalyptic number.

It is an amenable number.

13938561 is a deficient number, since it is larger than the sum of its proper divisors (12948607).

13938561 is a wasteful number, since it uses less digits than its factorization.

13938561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 115 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 13938561 is about 3733.4382276931. The cubic root of 13938561 is about 240.6611457704.

The spelling of 13938561 in words is "thirteen million, nine hundred thirty-eight thousand, five hundred sixty-one".