638258 has 4 divisors (see below), whose sum is σ = 957390. Its totient is φ = 319128.

The previous prime is 638233. The next prime is 638263. The reversal of 638258 is 852836.

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., 628849 + 9409 = 793^2 + 97^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638258.

It is an unprimeable number.

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, 159563 + ... + 159566.

2⁶³⁸²⁵⁸ is an apocalyptic number.

638258 is a deficient number, since it is larger than the sum of its proper divisors (319132).

638258 is a wasteful number, since it uses less digits than its factorization.

638258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319131.

The product of its digits is 11520, while the sum is 32.

The square root of 638258 is about 798.9105081297. The cubic root of 638258 is about 86.0991285288.

The spelling of 638258 in words is "six hundred thirty-eight thousand, two hundred fifty-eight".