3957820 has 12 divisors (see below), whose sum is σ = 8311464. Its totient is φ = 1583120.

The previous prime is 3957799. The next prime is 3957829. The reversal of 3957820 is 287593.

3957820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3957829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98926 + ... + 98965.

It is an arithmetic number, because the mean of its divisors is an integer number (692622).

Almost surely, 2^3957820 is an apocalyptic number.

It is an amenable number.

3957820 is an abundant number, since it is smaller than the sum of its proper divisors (4353644).

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

3957820 is a wasteful number, since it uses less digits than its factorization.

3957820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197900 (or 197898 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3957820 is about 1989.4270531990. The cubic root of 3957820 is about 158.1801608862.

The spelling of 3957820 in words is "three million, nine hundred fifty-seven thousand, eight hundred twenty".