3868161840 has 120 divisors (see below), whose sum is σ = 13014488448. Its totient is φ = 1029611520.

The previous prime is 3868161799. The next prime is 3868161859. The reversal of 3868161840 is 481618683.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 410785 + ... + 420095.

Almost surely, 2^3868161840 is an apocalyptic number.

3868161840 is a gapful number since it is divisible by the number (30) 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 3868161840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6507244224).

3868161840 is an abundant number, since it is smaller than the sum of its proper divisors (9146326608).

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

3868161840 is a wasteful number, since it uses less digits than its factorization.

3868161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907 (or 9898 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 3868161840 is about 62194.5483141408. The cubic root of 3868161840 is about 1569.7658568700.

The spelling of 3868161840 in words is "three billion, eight hundred sixty-eight million, one hundred sixty-one thousand, eight hundred forty".