3871920 has 160 divisors (see below), whose sum is σ = 13874112. Its totient is φ = 884736.

The previous prime is 3871919. The next prime is 3871921. The reversal of 3871920 is 291783.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3871919) and next prime (3871921).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (3871921) 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, 53004 + ... + 53076.

Almost surely, 2^3871920 is an apocalyptic number.

3871920 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 3871920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6937056).

3871920 is an abundant number, since it is smaller than the sum of its proper divisors (10002192).

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

3871920 is a wasteful number, since it uses less digits than its factorization.

3871920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3871920 is about 1967.7194922041. The cubic root of 3871920 is about 157.0274067399.

The spelling of 3871920 in words is "three million, eight hundred seventy-one thousand, nine hundred twenty".