639234 has 24 divisors (see below), whose sum is σ = 1467180. Its totient is φ = 200448.

The previous prime is 639211. The next prime is 639253. The reversal of 639234 is 432936.

639234 is a `hidden beast` number, since 639 + 23 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 558009 + 81225 = 747^2 + 285^2 .

It is a junction number, because it is equal to n+sod(n) for n = 639198 and 639207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 739 + ... + 1350.

2⁶³⁹²³⁴ is an apocalyptic number.

639234 is an abundant number, since it is smaller than the sum of its proper divisors (827946).

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

639234 is a wasteful number, since it uses less digits than its factorization.

639234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 2111 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 639234 is about 799.5211066632. The cubic root of 639234 is about 86.1429926886.

The spelling of 639234 in words is "six hundred thirty-nine thousand, two hundred thirty-four".