13725891 has 6 divisors (see below), whose sum is σ = 19826300. Its totient is φ = 9150588.

The previous prime is 13725889. The next prime is 13725911. The reversal of 13725891 is 19852731.

13725891 is a `hidden beast` number, since 1 + 3 + 72 + 589 + 1 = 666.

It is not a de Polignac number, because 13725891 - 2¹ = 13725889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13725841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 762541 + ... + 762558.

Almost surely, 2^13725891 is an apocalyptic number.

13725891 is a deficient number, since it is larger than the sum of its proper divisors (6100409).

13725891 is a wasteful number, since it uses less digits than its factorization.

13725891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525105 (or 1525102 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13725891 is about 3704.8469604020. The cubic root of 13725891 is about 239.4308911296.

It can be divided in two parts, 13 and 725891, that added together give a square (725904 = 852²).

The spelling of 13725891 in words is "thirteen million, seven hundred twenty-five thousand, eight hundred ninety-one".