4065440 has 24 divisors (see below), whose sum is σ = 9604980. Its totient is φ = 1626112.

The previous prime is 4065427. The next prime is 4065461. The reversal of 4065440 is 445604.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3671056 + 394384 = 1916^2 + 628^2 .

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, 12545 + ... + 12864.

Almost surely, 2^4065440 is an apocalyptic number.

4065440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4065440 is an abundant number, since it is smaller than the sum of its proper divisors (5539540).

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

4065440 is a wasteful number, since it uses less digits than its factorization.

4065440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25424 (or 25416 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 4065440 is about 2016.2936294102. The cubic root of 4065440 is about 159.6010896005.

The spelling of 4065440 in words is "four million, sixty-five thousand, four hundred forty".