639548 has 36 divisors (see below), whose sum is σ = 1407672. Its totient is φ = 252000.

The previous prime is 639547. The next prime is 639563. The reversal of 639548 is 845936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2423 + ... + 2673.

It is an arithmetic number, because the mean of its divisors is an integer number (39102).

2⁶³⁹⁵⁴⁸ 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 639548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703836).

639548 is an abundant number, since it is smaller than the sum of its proper divisors (768124).

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

639548 is a wasteful number, since it uses less digits than its factorization.

639548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 273 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 639548 is about 799.7174501035. The cubic root of 639548 is about 86.1570952300.

The spelling of 639548 in words is "six hundred thirty-nine thousand, five hundred forty-eight".