639516 has 24 divisors (see below), whose sum is σ = 1506960. Its totient is φ = 211072.

The previous prime is 639511. The next prime is 639517. The reversal of 639516 is 615936.

It is a happy number.

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 639516.

It is not an unprimeable number, because it can be changed into a prime (639511) 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, 1450 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (62790).

2⁶³⁹⁵¹⁶ is an apocalyptic number.

It is an amenable number.

639516 is an abundant number, since it is smaller than the sum of its proper divisors (867444).

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

639516 is a wasteful number, since it uses less digits than its factorization.

639516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533 (or 531 counting only the distinct ones).

The product of its digits is 4860, while the sum is 30.

The square root of 639516 is about 799.6974427870. The cubic root of 639516 is about 86.1556582396.

The spelling of 639516 in words is "six hundred thirty-nine thousand, five hundred sixteen".