3945040 has 40 divisors (see below), whose sum is σ = 10008288. Its totient is φ = 1434240.

The previous prime is 3945031. The next prime is 3945047. The reversal of 3945040 is 405493.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 3944996 and 3945014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362 + ... + 3121.

Almost surely, 2^3945040 is an apocalyptic number.

It is an amenable number.

3945040 is an abundant number, since it is smaller than the sum of its proper divisors (6063248).

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

3945040 is a wasteful number, since it uses less digits than its factorization.

3945040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4507 (or 4501 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 3945040 is about 1986.2124760458. The cubic root of 3945040 is about 158.0097200664.

The spelling of 3945040 in words is "three million, nine hundred forty-five thousand, forty".