638212 has 6 divisors (see below), whose sum is σ = 1116878. Its totient is φ = 319104.

The previous prime is 638201. The next prime is 638233. The reversal of 638212 is 212836.

It can be written as a sum of positive squares in only one way, i.e., 568516 + 69696 = 754^2 + 264^2 .

It is an unprimeable number.

638212 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 as a sum of consecutive naturals, namely, 79773 + ... + 79780.

2⁶³⁸²¹² is an apocalyptic number.

It is an amenable number.

638212 is a deficient number, since it is larger than the sum of its proper divisors (478666).

638212 is a wasteful number, since it uses less digits than its factorization.

638212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159557 (or 159555 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 638212 is about 798.8817184039. The cubic root of 638212 is about 86.0970600575.

The spelling of 638212 in words is "six hundred thirty-eight thousand, two hundred twelve".