639222 has 8 divisors (see below), whose sum is σ = 1278456. Its totient is φ = 213072.

The previous prime is 639211. The next prime is 639253. The reversal of 639222 is 222936.

639222 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.

639222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 639192 and 639201.

It is a congruent number.

It is an unprimeable number.

639222 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, 53263 + ... + 53274.

It is an arithmetic number, because the mean of its divisors is an integer number (159807).

2⁶³⁹²²² is an apocalyptic number.

639222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639222 is a wasteful number, since it uses less digits than its factorization.

639222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106542.

The product of its digits is 1296, while the sum is 24.

The square root of 639222 is about 799.5136021357. The cubic root of 639222 is about 86.1424536463.

It can be divided in two parts, 639 and 222, that added together give a triangular number (861 = T₄₁).

The spelling of 639222 in words is "six hundred thirty-nine thousand, two hundred twenty-two".