3945820 has 24 divisors (see below), whose sum is σ = 8389584. Its totient is φ = 1558656.

The previous prime is 3945803. The next prime is 3945841. The reversal of 3945820 is 285493.

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, 472 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (349566).

Almost surely, 2^3945820 is an apocalyptic number.

It is an amenable number.

3945820 is an abundant number, since it is smaller than the sum of its proper divisors (4443764).

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

3945820 is a wasteful number, since it uses less digits than its factorization.

3945820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469 (or 2467 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 3945820 is about 1986.4088199563. The cubic root of 3945820 is about 158.0201330965.

The spelling of 3945820 in words is "three million, nine hundred forty-five thousand, eight hundred twenty".