638234 has 4 divisors (see below), whose sum is σ = 957354. Its totient is φ = 319116.

The previous prime is 638233. The next prime is 638263. The reversal of 638234 is 432836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 635209 + 3025 = 797^2 + 55^2 .

It is a d-powerful number, because it can be written as 6⁶ + 3¹⁰ + 2⁹ + 8³ + 3¹² + 4³ .

It is not an unprimeable number, because it can be changed into a prime (638233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159557 + ... + 159560.

2⁶³⁸²³⁴ is an apocalyptic number.

638234 is a deficient number, since it is larger than the sum of its proper divisors (319120).

638234 is a wasteful number, since it uses less digits than its factorization.

638234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319119.

The product of its digits is 3456, while the sum is 26.

The square root of 638234 is about 798.8954875326. The cubic root of 638234 is about 86.0980493388.

The spelling of 638234 in words is "six hundred thirty-eight thousand, two hundred thirty-four".