639293 has 4 divisors (see below), whose sum is σ = 672960. Its totient is φ = 605628.

The previous prime is 639269. The next prime is 639299. The reversal of 639293 is 392936.

639293 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639293 - 2¹⁰ = 638269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639299) 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, 16805 + ... + 16842.

It is an arithmetic number, because the mean of its divisors is an integer number (168240).

2⁶³⁹²⁹³ is an apocalyptic number.

It is an amenable number.

639293 is a deficient number, since it is larger than the sum of its proper divisors (33667).

639293 is a wasteful number, since it uses less digits than its factorization.

639293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666.

The product of its digits is 8748, while the sum is 32.

The square root of 639293 is about 799.5580028991. The cubic root of 639293 is about 86.1456428815.

The spelling of 639293 in words is "six hundred thirty-nine thousand, two hundred ninety-three".