639306 has 16 divisors (see below), whose sum is σ = 1420800. Its totient is φ = 213084.

The previous prime is 639299. The next prime is 639307. The reversal of 639306 is 603936.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 639306.

It is not an unprimeable number, because it can be changed into a prime (639307) 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, 5866 + ... + 5973.

It is an arithmetic number, because the mean of its divisors is an integer number (88800).

2⁶³⁹³⁰⁶ is an apocalyptic number.

639306 is an abundant number, since it is smaller than the sum of its proper divisors (781494).

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

639306 is a wasteful number, since it uses less digits than its factorization.

639306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850 (or 11844 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 639306 is about 799.5661323493. The cubic root of 639306 is about 86.1462268003.

It can be divided in two parts, 63930 and 6, that added together give a palindrome (63936).

The spelling of 639306 in words is "six hundred thirty-nine thousand, three hundred six".