3905640 has 96 divisors (see below), whose sum is σ = 13384800. Its totient is φ = 984960.

The previous prime is 3905599. The next prime is 3905641. The reversal of 3905640 is 465093.

It is a happy number.

3905640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3905641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6555 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (139425).

Almost surely, 2^3905640 is an apocalyptic number.

3905640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3905640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6692400).

3905640 is an abundant number, since it is smaller than the sum of its proper divisors (9479160).

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

3905640 is a wasteful number, since it uses less digits than its factorization.

3905640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 3905640 is about 1976.2692124303. The cubic root of 3905640 is about 157.4819329238.

The spelling of 3905640 in words is "three million, nine hundred five thousand, six hundred forty".