639084 has 24 divisors (see below), whose sum is σ = 1570240. Its totient is φ = 201744.

The previous prime is 639083. The next prime is 639091. The reversal of 639084 is 480936.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (639083) 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, 1174 + ... + 1629.

2⁶³⁹⁰⁸⁴ is an apocalyptic number.

It is an amenable number.

639084 is an abundant number, since it is smaller than the sum of its proper divisors (931156).

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

639084 is a wasteful number, since it uses less digits than its factorization.

639084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2827 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 639084 is about 799.4272950056. The cubic root of 639084 is about 86.1362541756.

The spelling of 639084 in words is "six hundred thirty-nine thousand, eighty-four".