3961640 has 16 divisors (see below), whose sum is σ = 8913780. Its totient is φ = 1584640.

The previous prime is 3961631. The next prime is 3961649. The reversal of 3961640 is 461693.

3961640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3961631) and next prime (3961649).

It can be written as a sum of positive squares in 2 ways, for example, as 3786916 + 174724 = 1946^2 + 418^2 .

It is not an unprimeable number, because it can be changed into a prime (3961649) 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 3 ways as a sum of consecutive naturals, for example, 49481 + ... + 49560.

Almost surely, 2^3961640 is an apocalyptic number.

It is an amenable number.

3961640 is an abundant number, since it is smaller than the sum of its proper divisors (4952140).

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

3961640 is a wasteful number, since it uses less digits than its factorization.

3961640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99052 (or 99048 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 3961640 is about 1990.3868970630. The cubic root of 3961640 is about 158.2310351820.

The spelling of 3961640 in words is "three million, nine hundred sixty-one thousand, six hundred forty".