639294 has 16 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 208472.

The previous prime is 639269. The next prime is 639299. The reversal of 639294 is 492936.

639294 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639294.

It is not an unprimeable number, because it can be changed into a prime (639299) by changing a digit.

639294 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 7 ways as a sum of consecutive naturals, for example, 852 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2⁶³⁹²⁹⁴ is an apocalyptic number.

639294 is an abundant number, since it is smaller than the sum of its proper divisors (667074).

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

639294 is a wasteful number, since it uses less digits than its factorization.

639294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its digits is 11664, while the sum is 33.

The square root of 639294 is about 799.5586282444. The cubic root of 639294 is about 86.1456877986.

The spelling of 639294 in words is "six hundred thirty-nine thousand, two hundred ninety-four".