638312 has 16 divisors (see below), whose sum is σ = 1214340. Its totient is φ = 314496.

The previous prime is 638303. The next prime is 638317. The reversal of 638312 is 213836.

It can be written as a sum of positive squares in 2 ways, for example, as 556516 + 81796 = 746^2 + 286^2 .

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (638317) by changing a digit.

638312 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 1130.

2⁶³⁸³¹² is an apocalyptic number.

It is an amenable number.

638312 is a deficient number, since it is larger than the sum of its proper divisors (576028).

638312 is a wasteful number, since it uses less digits than its factorization.

638312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172 (or 1168 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 638312 is about 798.9443034405. The cubic root of 638312 is about 86.1015566075.

The spelling of 638312 in words is "six hundred thirty-eight thousand, three hundred twelve".