639030 has 64 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 136704.

The previous prime is 639011. The next prime is 639043. The reversal of 639030 is 30936.

639030 is nontrivially palindromic in base 4.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 638988 and 639006.

It is a congruent number.

It is an unprimeable number.

639030 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3481 + ... + 3659.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2⁶³⁹⁰³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933120).

639030 is an abundant number, since it is smaller than the sum of its proper divisors (1227210).

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

639030 is a wasteful number, since it uses less digits than its factorization.

639030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 639030 is about 799.3935201138. The cubic root of 639030 is about 86.1338280528.

Adding to 639030 its reverse (30936), we get a palindrome (669966).

The spelling of 639030 in words is "six hundred thirty-nine thousand, thirty".