3970640 has 20 divisors (see below), whose sum is σ = 9231924. Its totient is φ = 1588224.

The previous prime is 3970633. The next prime is 3970643. The reversal of 3970640 is 460793.

It can be written as a sum of positive squares in 2 ways, for example, as 1175056 + 2795584 = 1084^2 + 1672^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3970643) 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, 24737 + ... + 24896.

Almost surely, 2^3970640 is an apocalyptic number.

It is an amenable number.

3970640 is an abundant number, since it is smaller than the sum of its proper divisors (5261284).

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

3970640 is a wasteful number, since it uses less digits than its factorization.

3970640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49646 (or 49640 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 3970640 is about 1992.6464814412. The cubic root of 3970640 is about 158.3507669323.

The spelling of 3970640 in words is "three million, nine hundred seventy thousand, six hundred forty".