3871840 has 48 divisors (see below), whose sum is σ = 10456992. Its totient is φ = 1327104.

The previous prime is 3871831. The next prime is 3871841. The reversal of 3871840 is 481783.

It is a happy number.

It is a super-2 number, since 2×3871840² = 29982289971200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (217854).

Almost surely, 2^3871840 is an apocalyptic number.

It is an amenable number.

3871840 is an abundant number, since it is smaller than the sum of its proper divisors (6585152).

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

3871840 is a wasteful number, since it uses less digits than its factorization.

3871840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479 (or 3471 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 3871840 is about 1967.6991639984. The cubic root of 3871840 is about 157.0263252542.

The spelling of 3871840 in words is "three million, eight hundred seventy-one thousand, eight hundred forty".