640914 has 16 divisors (see below), whose sum is σ = 1316928. Its totient is φ = 207792.

The previous prime is 640907. The next prime is 640919. The reversal of 640914 is 419046.

640914 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640914.

It is not an unprimeable number, because it can be changed into a prime (640919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222 + ... + 1665.

It is an arithmetic number, because the mean of its divisors is an integer number (82308).

2⁶⁴⁰⁹¹⁴ is an apocalyptic number.

640914 is an abundant number, since it is smaller than the sum of its proper divisors (676014).

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

640914 is a wasteful number, since it uses less digits than its factorization.

640914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 640914 is about 800.5710461914. The cubic root of 640914 is about 86.2183921148.

The spelling of 640914 in words is "six hundred forty thousand, nine hundred fourteen".