3855111840 has 96 divisors (see below), whose sum is σ = 13492906560. Its totient is φ = 1028028672.

The previous prime is 3855111833. The next prime is 3855111847. The reversal of 3855111840 is 481115583.

It is an interprime number because it is at equal distance from previous prime (3855111833) and next prime (3855111847).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3855111795 and 3855111804.

It is not an unprimeable number, because it can be changed into a prime (3855111847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441874 + ... + 450513.

It is an arithmetic number, because the mean of its divisors is an integer number (140551110).

Almost surely, 2^3855111840 is an apocalyptic number.

3855111840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3855111840 is an abundant number, since it is smaller than the sum of its proper divisors (9637794720).

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

3855111840 is a wasteful number, since it uses less digits than its factorization.

3855111840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892411 (or 892397 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 3855111840 is about 62089.5469463258. The cubic root of 3855111840 is about 1567.9985639651.

The spelling of 3855111840 in words is "three billion, eight hundred fifty-five million, one hundred eleven thousand, eight hundred forty".