638353 has 4 divisors (see below), whose sum is σ = 646128. Its totient is φ = 630580.

The previous prime is 638347. The next prime is 638359. The reversal of 638353 is 353836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (638347) and next prime (638359).

It is a cyclic number.

It is not a de Polignac number, because 638353 - 2⁹ = 637841 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638359) 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 in 3 ways as a sum of consecutive naturals, for example, 3763 + ... + 3928.

It is an arithmetic number, because the mean of its divisors is an integer number (161532).

2⁶³⁸³⁵³ is an apocalyptic number.

It is an amenable number.

638353 is a deficient number, since it is larger than the sum of its proper divisors (7775).

638353 is an equidigital number, since it uses as much as digits as its factorization.

638353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7774.

The product of its digits is 6480, while the sum is 28.

The square root of 638353 is about 798.9699618884. The cubic root of 638353 is about 86.1034000572.

The spelling of 638353 in words is "six hundred thirty-eight thousand, three hundred fifty-three".