3889640 has 16 divisors (see below), whose sum is σ = 8751780. Its totient is φ = 1555840.

The previous prime is 3889631. The next prime is 3889649. The reversal of 3889640 is 469883.

It is an interprime number because it is at equal distance from previous prime (3889631) and next prime (3889649).

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 770884 = 1766^2 + 878^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3889594 and 3889603.

It is not an unprimeable number, because it can be changed into a prime (3889649) 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, 48581 + ... + 48660.

Almost surely, 2^3889640 is an apocalyptic number.

It is an amenable number.

3889640 is an abundant number, since it is smaller than the sum of its proper divisors (4862140).

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

3889640 is a wasteful number, since it uses less digits than its factorization.

3889640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97252 (or 97248 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 3889640 is about 1972.2170265972. The cubic root of 3889640 is about 157.2665896799.

The spelling of 3889640 in words is "three million, eight hundred eighty-nine thousand, six hundred forty".