13820855 has 4 divisors (see below), whose sum is σ = 16585032. Its totient is φ = 11056680.

The previous prime is 13820843. The next prime is 13820857. The reversal of 13820855 is 55802831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55802831 = 7 ⋅7971833.

It is not a de Polignac number, because 13820855 - 2¹⁴ = 13804471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13820857) 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, 1382081 + ... + 1382090.

It is an arithmetic number, because the mean of its divisors is an integer number (4146258).

Almost surely, 2^13820855 is an apocalyptic number.

13820855 is a deficient number, since it is larger than the sum of its proper divisors (2764177).

13820855 is an equidigital number, since it uses as much as digits as its factorization.

13820855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764176.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 13820855 is about 3717.6410531411. The cubic root of 13820855 is about 239.9817983881.

The spelling of 13820855 in words is "thirteen million, eight hundred twenty thousand, eight hundred fifty-five".