639346 has 4 divisors (see below), whose sum is σ = 959022. Its totient is φ = 319672.

The previous prime is 639337. The next prime is 639361. The reversal of 639346 is 643936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 378225 + 261121 = 615^2 + 511^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159835 + ... + 159838.

2⁶³⁹³⁴⁶ is an apocalyptic number.

639346 is a deficient number, since it is larger than the sum of its proper divisors (319676).

639346 is a wasteful number, since it uses less digits than its factorization.

639346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319675.

The product of its digits is 11664, while the sum is 31.

The square root of 639346 is about 799.5911455238. The cubic root of 639346 is about 86.1480234242.

It can be divided in two parts, 63 and 9346, that added together give a square (9409 = 97²).

The spelling of 639346 in words is "six hundred thirty-nine thousand, three hundred forty-six".