3945680 has 80 divisors (see below), whose sum is σ = 9951744. Its totient is φ = 1451520.

The previous prime is 3945677. The next prime is 3945701. The reversal of 3945680 is 865493.

It is a tau number, because it is divible by the number of its divisors (80).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3945680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91739 + ... + 91781.

Almost surely, 2^3945680 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 3945680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4975872).

3945680 is an abundant number, since it is smaller than the sum of its proper divisors (6006064).

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

3945680 is a wasteful number, since it uses less digits than its factorization.

3945680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 118 counting only the distinct ones).

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

The square root of 3945680 is about 1986.3735801707. The cubic root of 3945680 is about 158.0182641921.

The spelling of 3945680 in words is "three million, nine hundred forty-five thousand, six hundred eighty".