639213 has 8 divisors (see below), whose sum is σ = 864576. Its totient is φ = 420000.

The previous prime is 639211. The next prime is 639253. The reversal of 639213 is 312936.

639213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 639213 - 2¹ = 639211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639211) 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, 1288 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (108072).

2⁶³⁹²¹³ is an apocalyptic number.

It is an amenable number.

639213 is a deficient number, since it is larger than the sum of its proper divisors (225363).

639213 is a wasteful number, since it uses less digits than its factorization.

639213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075.

The product of its digits is 972, while the sum is 24.

The square root of 639213 is about 799.5079736938. The cubic root of 639213 is about 86.1420493602.

The spelling of 639213 in words is "six hundred thirty-nine thousand, two hundred thirteen".