639852 has 24 divisors (see below), whose sum is σ = 1516032. Its totient is φ = 210000.

The previous prime is 639851. The next prime is 639853. The reversal of 639852 is 258936.

It is a happy number.

639852 is digitally balanced in base 2, 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 (639851) and next prime (639853).

It is not an unprimeable number, because it can be changed into a prime (639851) 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, 477 + ... + 1227.

It is an arithmetic number, because the mean of its divisors is an integer number (63168).

2⁶³⁹⁸⁵² is an apocalyptic number.

It is an amenable number.

639852 is an abundant number, since it is smaller than the sum of its proper divisors (876180).

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

639852 is a wasteful number, since it uses less digits than its factorization.

639852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 827 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 639852 is about 799.9074946517. The cubic root of 639852 is about 86.1707442489.

The spelling of 639852 in words is "six hundred thirty-nine thousand, eight hundred fifty-two".