3958640 has 40 divisors (see below), whose sum is σ = 10520160. Its totient is φ = 1357056.

The previous prime is 3958627. The next prime is 3958657. The reversal of 3958640 is 468593.

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

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 3958640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2975 + ... + 4094.

It is an arithmetic number, because the mean of its divisors is an integer number (263004).

Almost surely, 2^3958640 is an apocalyptic number.

It is an amenable number.

3958640 is an abundant number, since it is smaller than the sum of its proper divisors (6561520).

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

3958640 is a wasteful number, since it uses less digits than its factorization.

3958640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7089 (or 7083 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3958640 is about 1989.6331320120. The cubic root of 3958640 is about 158.1910843049.

The spelling of 3958640 in words is "three million, nine hundred fifty-eight thousand, six hundred forty".