3921440 has 24 divisors (see below), whose sum is σ = 9264780. Its totient is φ = 1568512.

The previous prime is 3921413. The next prime is 3921451. The reversal of 3921440 is 441293.

3921440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3794704 + 126736 = 1948^2 + 356^2 .

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 3 ways as a sum of consecutive naturals, for example, 12095 + ... + 12414.

Almost surely, 2^3921440 is an apocalyptic number.

It is an amenable number.

3921440 is an abundant number, since it is smaller than the sum of its proper divisors (5343340).

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

3921440 is a wasteful number, since it uses less digits than its factorization.

3921440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24524 (or 24516 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 3921440 is about 1980.2626088476. The cubic root of 3921440 is about 157.6940080050.

The spelling of 3921440 in words is "three million, nine hundred twenty-one thousand, four hundred forty".