13865121 has 16 divisors (see below), whose sum is σ = 21097600. Its totient is φ = 8992944.

The previous prime is 13865101. The next prime is 13865147. The reversal of 13865121 is 12156831.

13865121 is a `hidden beast` number, since 1 + 3 + 8 + 651 + 2 + 1 = 666.

It is not a de Polignac number, because 13865121 - 2⁷ = 13864993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13865101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5941 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (1318600).

Almost surely, 2^13865121 is an apocalyptic number.

It is an amenable number.

13865121 is a deficient number, since it is larger than the sum of its proper divisors (7232479).

13865121 is a wasteful number, since it uses less digits than its factorization.

13865121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13925 (or 13919 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 13865121 is about 3723.5898001794. The cubic root of 13865121 is about 240.2377331845.

The spelling of 13865121 in words is "thirteen million, eight hundred sixty-five thousand, one hundred twenty-one".