3951820 has 48 divisors (see below), whose sum is σ = 8981280. Its totient is φ = 1455104.

The previous prime is 3951811. The next prime is 3951841. The reversal of 3951820 is 281593.

3951820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19962 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (187110).

Almost surely, 2^3951820 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 3951820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4490640).

3951820 is an abundant number, since it is smaller than the sum of its proper divisors (5029460).

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

3951820 is a wasteful number, since it uses less digits than its factorization.

3951820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3951820 is about 1987.9185093962. The cubic root of 3951820 is about 158.1001874860.

The spelling of 3951820 in words is "three million, nine hundred fifty-one thousand, eight hundred twenty".