13851854520 has 128 divisors (see below), whose sum is σ = 47535690240. Its totient is φ = 3163230720.

The previous prime is 13851854509. The next prime is 13851854521. The reversal of 13851854520 is 2545815831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13851854521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 985059 + ... + 999021.

It is an arithmetic number, because the mean of its divisors is an integer number (371372580).

Almost surely, 2^13851854520 is an apocalyptic number.

13851854520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13851854520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23767845120).

13851854520 is an abundant number, since it is smaller than the sum of its proper divisors (33683835720).

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

13851854520 is a wasteful number, since it uses less digits than its factorization.

13851854520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15165 (or 15161 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 42.

The spelling of 13851854520 in words is "thirteen billion, eight hundred fifty-one million, eight hundred fifty-four thousand, five hundred twenty".