639226 has 8 divisors (see below), whose sum is σ = 1095840. Its totient is φ = 273948.

The previous prime is 639211. The next prime is 639253. The reversal of 639226 is 622936.

639226 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 a junction number, because it is equal to n+sod(n) for n = 639194 and 639203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22816 + ... + 22843.

It is an arithmetic number, because the mean of its divisors is an integer number (136980).

2⁶³⁹²²⁶ is an apocalyptic number.

639226 is a deficient number, since it is larger than the sum of its proper divisors (456614).

639226 is a wasteful number, since it uses less digits than its factorization.

639226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45668.

The product of its digits is 3888, while the sum is 28.

The square root of 639226 is about 799.5161036527. The cubic root of 639226 is about 86.1426333278.

Subtracting from 639226 its reverse (622936), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 639226 in words is "six hundred thirty-nine thousand, two hundred twenty-six".