638322 has 16 divisors (see below), whose sum is σ = 1285632. Its totient is φ = 211280.

The previous prime is 638317. The next prime is 638327. The reversal of 638322 is 223836.

It is an interprime number because it is at equal distance from previous prime (638317) and next prime (638327).

It is a junction number, because it is equal to n+sod(n) for n = 638292 and 638301.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638322.

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

638322 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868 + ... + 1424.

It is an arithmetic number, because the mean of its divisors is an integer number (80352).

2⁶³⁸³²² is an apocalyptic number.

638322 is an abundant number, since it is smaller than the sum of its proper divisors (647310).

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

638322 is a wasteful number, since it uses less digits than its factorization.

638322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its digits is 1728, while the sum is 24.

The square root of 638322 is about 798.9505616745. The cubic root of 638322 is about 86.1020062366.

It can be divided in two parts, 63 and 8322, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 638322 in words is "six hundred thirty-eight thousand, three hundred twenty-two".