639122 has 24 divisors (see below), whose sum is σ = 1117200. Its totient is φ = 273240.

The previous prime is 639091. The next prime is 639137. The reversal of 639122 is 221936.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4529 + ... + 4667.

It is an arithmetic number, because the mean of its divisors is an integer number (46550).

2⁶³⁹¹²² is an apocalyptic number.

639122 is a deficient number, since it is larger than the sum of its proper divisors (478078).

639122 is a wasteful number, since it uses less digits than its factorization.

639122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 171 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 639122 is about 799.4510616667. The cubic root of 639122 is about 86.1379613653.

The spelling of 639122 in words is "six hundred thirty-nine thousand, one hundred twenty-two".