13851855 has 48 divisors (see below), whose sum is σ = 26788320. Its totient is φ = 6580224.

The previous prime is 13851853. The next prime is 13851857. The reversal of 13851855 is 55815831.

13851855 is a `hidden beast` number, since 138 + 518 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (13851853) and next prime (13851857).

It is not a de Polignac number, because 13851855 - 2¹ = 13851853 is a prime.

Its product of digits (24000) is a multiple of the sum of its prime factors (1000).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13851853) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14059 + ... + 15011.

It is an arithmetic number, because the mean of its divisors is an integer number (558090).

Almost surely, 2^13851855 is an apocalyptic number.

13851855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13851855 is a deficient number, since it is larger than the sum of its proper divisors (12936465).

13851855 is a wasteful number, since it uses less digits than its factorization.

13851855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 997 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 13851855 is about 3721.8080283647. The cubic root of 13851855 is about 240.1610897678.

It can be divided in two parts, 13851 and 855, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 13851855 in words is "thirteen million, eight hundred fifty-one thousand, eight hundred fifty-five".