3972820 has 12 divisors (see below), whose sum is σ = 8342964. Its totient is φ = 1589120.

The previous prime is 3972817. The next prime is 3972833. The reversal of 3972820 is 282793.

It can be written as a sum of positive squares in 2 ways, for example, as 2617924 + 1354896 = 1618^2 + 1164^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99301 + ... + 99340.

It is an arithmetic number, because the mean of its divisors is an integer number (695247).

Almost surely, 2^3972820 is an apocalyptic number.

It is an amenable number.

3972820 is an abundant number, since it is smaller than the sum of its proper divisors (4370144).

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

3972820 is a wasteful number, since it uses less digits than its factorization.

3972820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198650 (or 198648 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3972820 is about 1993.1934176090. The cubic root of 3972820 is about 158.3797413978.

The spelling of 3972820 in words is "three million, nine hundred seventy-two thousand, eight hundred twenty".