640294 has 8 divisors (see below), whose sum is σ = 964080. Its totient is φ = 318936.

The previous prime is 640279. The next prime is 640303. The reversal of 640294 is 492046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

640294 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (120510).

2⁶⁴⁰²⁹⁴ is an apocalyptic number.

640294 is a deficient number, since it is larger than the sum of its proper divisors (323786).

640294 is a wasteful number, since it uses less digits than its factorization.

640294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 640294 is about 800.1837289023. The cubic root of 640294 is about 86.1905814936.

The spelling of 640294 in words is "six hundred forty thousand, two hundred ninety-four".