640232 has 16 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 317680.

The previous prime is 640231. The next prime is 640247. The reversal of 640232 is 232046.

It is a self number, because there is not a number n which added to its sum of digits gives 640232.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640232.

It is not an unprimeable number, because it can be changed into a prime (640231) 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, 1319 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (75600).

2⁶⁴⁰²³² is an apocalyptic number.

It is an amenable number.

640232 is a deficient number, since it is larger than the sum of its proper divisors (569368).

640232 is a wasteful number, since it uses less digits than its factorization.

640232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 640232 is about 800.1449868618. The cubic root of 640232 is about 86.1877994443.

Adding to 640232 its reverse (232046), we get a palindrome (872278).

The spelling of 640232 in words is "six hundred forty thousand, two hundred thirty-two".