638012 has 6 divisors (see below), whose sum is σ = 1116528. Its totient is φ = 319004.

The previous prime is 637939. The next prime is 638023. The reversal of 638012 is 210836.

It is a congruent number.

It is an unprimeable number.

638012 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 as a sum of consecutive naturals, namely, 79748 + ... + 79755.

It is an arithmetic number, because the mean of its divisors is an integer number (186088).

2⁶³⁸⁰¹² is an apocalyptic number.

It is an amenable number.

638012 is a deficient number, since it is larger than the sum of its proper divisors (478516).

638012 is a wasteful number, since it uses less digits than its factorization.

638012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159507 (or 159505 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 638012 is about 798.7565336196. The cubic root of 638012 is about 86.0880655484.

Adding to 638012 its reverse (210836), we get a palindrome (848848).

The spelling of 638012 in words is "six hundred thirty-eight thousand, twelve".