638934 has 16 divisors (see below), whose sum is σ = 1294272. Its totient is φ = 210248.

The previous prime is 638933. The next prime is 638959. The reversal of 638934 is 439836.

It is a junction number, because it is equal to n+sod(n) for n = 638895 and 638904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638933) 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, 144 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (80892).

2⁶³⁸⁹³⁴ is an apocalyptic number.

638934 is an abundant number, since it is smaller than the sum of its proper divisors (655338).

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

638934 is a wasteful number, since it uses less digits than its factorization.

638934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its digits is 15552, while the sum is 33.

The square root of 638934 is about 799.3334723380. Note that the first 3 decimals coincide. The cubic root of 638934 is about 86.1295146082.

The spelling of 638934 in words is "six hundred thirty-eight thousand, nine hundred thirty-four".