3871890 has 48 divisors (see below), whose sum is σ = 10984896. Its totient is φ = 938400.

The previous prime is 3871883. The next prime is 3871909. The reversal of 3871890 is 981783.

It is a Curzon number.

It is a congruent number.

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, 966 + ... + 2945.

It is an arithmetic number, because the mean of its divisors is an integer number (228852).

Almost surely, 2^3871890 is an apocalyptic number.

3871890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3871890 is an abundant number, since it is smaller than the sum of its proper divisors (7113006).

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

3871890 is a wasteful number, since it uses less digits than its factorization.

3871890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935 (or 3932 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 3871890 is about 1967.7118691516. The cubic root of 3871890 is about 157.0270011845.

It can be divided in two parts, 3871 and 890, that added together give a square (4761 = 69²).

The spelling of 3871890 in words is "three million, eight hundred seventy-one thousand, eight hundred ninety".