13889885 has 4 divisors (see below), whose sum is σ = 16667868. Its totient is φ = 11111904.

The previous prime is 13889881. The next prime is 13889917. The reversal of 13889885 is 58898831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58898831 = 71 ⋅829561.

It can be written as a sum of positive squares in 2 ways, for example, as 8076964 + 5812921 = 2842^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 13889885 - 2² = 13889881 is a prime.

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 (13889881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388984 + ... + 1388993.

It is an arithmetic number, because the mean of its divisors is an integer number (4166967).

Almost surely, 2^13889885 is an apocalyptic number.

It is an amenable number.

13889885 is a deficient number, since it is larger than the sum of its proper divisors (2777983).

13889885 is an equidigital number, since it uses as much as digits as its factorization.

13889885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777982.

The product of its digits is 552960, while the sum is 50.

The square root of 13889885 is about 3726.9136024330. The cubic root of 13889885 is about 240.3806748105.

The spelling of 13889885 in words is "thirteen million, eight hundred eighty-nine thousand, eight hundred eighty-five".