3921920 has 48 divisors (see below), whose sum is σ = 9434880. Its totient is φ = 1564672.

The previous prime is 3921919. The next prime is 3921941. The reversal of 3921920 is 291293.

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 3921920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10049 + ... + 10431.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

Almost surely, 2^3921920 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 3921920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4717440).

3921920 is an abundant number, since it is smaller than the sum of its proper divisors (5512960).

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

3921920 is an equidigital number, since it uses as much as digits as its factorization.

3921920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 3921920 is about 1980.3838011860. The cubic root of 3921920 is about 157.7004418690.

The spelling of 3921920 in words is "three million, nine hundred twenty-one thousand, nine hundred twenty".