639380 has 24 divisors (see below), whose sum is σ = 1534848. Its totient is φ = 219168.

The previous prime is 639371. The next prime is 639391. The reversal of 639380 is 83936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2144 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (63952).

2⁶³⁹³⁸⁰ is an apocalyptic number.

It is an amenable number.

639380 is an abundant number, since it is smaller than the sum of its proper divisors (895468).

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

639380 is a wasteful number, since it uses less digits than its factorization.

639380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4583 (or 4581 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 639380 is about 799.6124061069. The cubic root of 639380 is about 86.1495504955.

The spelling of 639380 in words is "six hundred thirty-nine thousand, three hundred eighty".