3952640 has 52 divisors (see below), whose sum is σ = 9534324. Its totient is φ = 1572864.

The previous prime is 3952633. The next prime is 3952649. The reversal of 3952640 is 462593.

It can be written as a sum of positive squares in 2 ways, for example, as 1183744 + 2768896 = 1088^2 + 1664^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3952649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20384 + ... + 20576.

Almost surely, 2^3952640 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 3952640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4767162).

3952640 is an abundant number, since it is smaller than the sum of its proper divisors (5581684).

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

3952640 is an equidigital number, since it uses as much as digits as its factorization.

3952640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 200 counting only the distinct ones).

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

The square root of 3952640 is about 1988.1247445772. The cubic root of 3952640 is about 158.1111219574. Note that the first 4 decimals are identical.

The spelling of 3952640 in words is "three million, nine hundred fifty-two thousand, six hundred forty".