640065039 has 4 divisors (see below), whose sum is σ = 853420056. Its totient is φ = 426710024.

The previous prime is 640065037. The next prime is 640065043. The reversal of 640065039 is 930560046.

It is a happy number.

640065039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640065039 - 2¹ = 640065037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640065037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106677504 + ... + 106677509.

It is an arithmetic number, because the mean of its divisors is an integer number (213355014).

Almost surely, 2^640065039 is an apocalyptic number.

640065039 is a deficient number, since it is larger than the sum of its proper divisors (213355017).

640065039 is a wasteful number, since it uses less digits than its factorization.

640065039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213355016.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 640065039 is about 25299.5066947955. The cubic root of 640065039 is about 861.8030671652.

The spelling of 640065039 in words is "six hundred forty million, sixty-five thousand, thirty-nine".