3939920 has 40 divisors (see below), whose sum is σ = 9702504. Its totient is φ = 1482752.

The previous prime is 3939919. The next prime is 3939931. The reversal of 3939920 is 299393.

It can be written as a sum of positive squares in 4 ways, for example, as 238144 + 3701776 = 488^2 + 1924^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 89 + ... + 2808.

Almost surely, 2^3939920 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 3939920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4851252).

3939920 is an abundant number, since it is smaller than the sum of its proper divisors (5762584).

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

3939920 is a wasteful number, since it uses less digits than its factorization.

3939920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927 (or 2921 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 3939920 is about 1984.9231723168. The cubic root of 3939920 is about 157.9413337716.

The spelling of 3939920 in words is "three million, nine hundred thirty-nine thousand, nine hundred twenty".