3881840 has 20 divisors (see below), whose sum is σ = 9025464. Its totient is φ = 1552704.

The previous prime is 3881837. The next prime is 3881849. The reversal of 3881840 is 481883.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 3881797 and 3881806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3881849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24182 + ... + 24341.

Almost surely, 2^3881840 is an apocalyptic number.

It is an amenable number.

3881840 is an abundant number, since it is smaller than the sum of its proper divisors (5143624).

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

3881840 is a wasteful number, since it uses less digits than its factorization.

3881840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48536 (or 48530 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 3881840 is about 1970.2385642353. The cubic root of 3881840 is about 157.1613956877.

The spelling of 3881840 in words is "three million, eight hundred eighty-one thousand, eight hundred forty".