4065640 has 16 divisors (see below), whose sum is σ = 9147780. Its totient is φ = 1626240.

The previous prime is 4065637. The next prime is 4065653. The reversal of 4065640 is 465604.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3526884 + 538756 = 1878^2 + 734^2 .

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, 50781 + ... + 50860.

Almost surely, 2^4065640 is an apocalyptic number.

4065640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4065640 is an abundant number, since it is smaller than the sum of its proper divisors (5082140).

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

4065640 is a wasteful number, since it uses less digits than its factorization.

4065640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101652 (or 101648 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 4065640 is about 2016.3432247512. The cubic root of 4065640 is about 159.6037067583.

The spelling of 4065640 in words is "four million, sixty-five thousand, six hundred forty".