638323 has 8 divisors (see below), whose sum is σ = 744800. Its totient is φ = 546840.

The previous prime is 638317. The next prime is 638327. The reversal of 638323 is 323836.

It is a de Polignac number, because none of the positive numbers 2^k-638323 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (638327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (93100).

2⁶³⁸³²³ is an apocalyptic number.

638323 is a deficient number, since it is larger than the sum of its proper divisors (106477).

638323 is an equidigital number, since it uses as much as digits as its factorization.

638323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882 (or 1868 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 638323 is about 798.9511874952. The cubic root of 638323 is about 86.1020511993.

It can be divided in two parts, 638 and 323, that added together give a square (961 = 31²).

The spelling of 638323 in words is "six hundred thirty-eight thousand, three hundred twenty-three".