639132 has 48 divisors (see below), whose sum is σ = 1707552. Its totient is φ = 184320.

The previous prime is 639091. The next prime is 639137. The reversal of 639132 is 231936.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639132.

It is not an unprimeable number, because it can be changed into a prime (639137) by changing a digit.

639132 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 2772.

It is an arithmetic number, because the mean of its divisors is an integer number (35574).

2⁶³⁹¹³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853776).

639132 is an abundant number, since it is smaller than the sum of its proper divisors (1068420).

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

639132 is a wasteful number, since it uses less digits than its factorization.

639132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 276 counting only the distinct ones).

The product of its digits is 972, while the sum is 24.

The square root of 639132 is about 799.4573159338. The cubic root of 639132 is about 86.1384106145.

It can be divided in two parts, 639 and 132, that multiplied together give a palindrome (84348).

The spelling of 639132 in words is "six hundred thirty-nine thousand, one hundred thirty-two".