13865550 has 48 divisors (see below), whose sum is σ = 35890560. Its totient is φ = 3535840.

The previous prime is 13865549. The next prime is 13865581. The reversal of 13865550 is 5556831.

13865550 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 a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1441 + ... + 5459.

It is an arithmetic number, because the mean of its divisors is an integer number (747720).

Almost surely, 2^13865550 is an apocalyptic number.

13865550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13865550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17945280).

13865550 is an abundant number, since it is smaller than the sum of its proper divisors (22025010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13865550 is a wasteful number, since it uses less digits than its factorization.

13865550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057 (or 4052 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 13865550 is about 3723.6474054346. The cubic root of 13865550 is about 240.2402108867.

The spelling of 13865550 in words is "thirteen million, eight hundred sixty-five thousand, five hundred fifty".