639333 has 14 divisors (see below), whose sum is σ = 959654. Its totient is φ = 425736.

The previous prime is 639329. The next prime is 639337. The reversal of 639333 is 333936.

639333 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (639329) and next prime (639337).

It can be written as a sum of positive squares in only one way, i.e., 613089 + 26244 = 783^2 + 162^2 .

It is not a de Polignac number, because 639333 - 2² = 639329 is a prime.

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

It is a d-powerful number, because it can be written as 6⁶ + 3⁶ + 3⁶ + 9³ + 3¹⁰ + 3¹² .

It is a Duffinian number.

639333 is strictly pandigital in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 639297 and 639306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639337) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 291 + ... + 1167.

2⁶³⁹³³³ is an apocalyptic number.

It is an amenable number.

639333 is a deficient number, since it is larger than the sum of its proper divisors (320321).

639333 is an frugal number, since it uses more digits than its factorization.

639333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895 (or 880 counting only the distinct ones).

The product of its digits is 4374, while the sum is 27.

The square root of 639333 is about 799.5830163279. The cubic root of 639333 is about 86.1474395296.

It can be divided in two parts, 63933 and 3, that added together give a palindrome (63936).

The spelling of 639333 in words is "six hundred thirty-nine thousand, three hundred thirty-three".