3925640 has 64 divisors (see below), whose sum is σ = 9797760. Its totient is φ = 1408000.

The previous prime is 3925637. The next prime is 3925667. The reversal of 3925640 is 465293.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15515 + ... + 15765.

It is an arithmetic number, because the mean of its divisors is an integer number (153090).

Almost surely, 2^3925640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3925640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4898880).

3925640 is an abundant number, since it is smaller than the sum of its proper divisors (5872120).

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

3925640 is a wasteful number, since it uses less digits than its factorization.

3925640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 3925640 is about 1981.3227904610. The cubic root of 3925640 is about 157.7502865251.

The spelling of 3925640 in words is "three million, nine hundred twenty-five thousand, six hundred forty".