3871940 has 12 divisors (see below), whose sum is σ = 8131116. Its totient is φ = 1548768.

The previous prime is 3871921. The next prime is 3871961. The reversal of 3871940 is 491783.

It can be written as a sum of positive squares in 2 ways, for example, as 1844164 + 2027776 = 1358^2 + 1424^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3871897 and 3871906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96779 + ... + 96818.

It is an arithmetic number, because the mean of its divisors is an integer number (677593).

Almost surely, 2^3871940 is an apocalyptic number.

It is an amenable number.

3871940 is an abundant number, since it is smaller than the sum of its proper divisors (4259176).

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

3871940 is a wasteful number, since it uses less digits than its factorization.

3871940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193606 (or 193604 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 3871940 is about 1967.7245742227. The cubic root of 3871940 is about 157.0276771090.

The spelling of 3871940 in words is "three million, eight hundred seventy-one thousand, nine hundred forty".