639598 has 8 divisors (see below), whose sum is σ = 971208. Its totient is φ = 315864.

The previous prime is 639589. The next prime is 639599. The reversal of 639598 is 895936.

639598 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 639598.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1761 + ... + 2092.

It is an arithmetic number, because the mean of its divisors is an integer number (121401).

2⁶³⁹⁵⁹⁸ is an apocalyptic number.

639598 is a deficient number, since it is larger than the sum of its proper divisors (331610).

639598 is a wasteful number, since it uses less digits than its factorization.

639598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938.

The product of its digits is 58320, while the sum is 40.

The square root of 639598 is about 799.7487105335. The cubic root of 639598 is about 86.1593404316.

The spelling of 639598 in words is "six hundred thirty-nine thousand, five hundred ninety-eight".