638213 has 8 divisors (see below), whose sum is σ = 671232. Its totient is φ = 606096.

The previous prime is 638201. The next prime is 638233. The reversal of 638213 is 312836.

638213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556 + ... + 1922.

It is an arithmetic number, because the mean of its divisors is an integer number (83904).

2⁶³⁸²¹³ is an apocalyptic number.

It is an amenable number.

638213 is a deficient number, since it is larger than the sum of its proper divisors (33019).

638213 is a wasteful number, since it uses less digits than its factorization.

638213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451.

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

The square root of 638213 is about 798.8823442786. The cubic root of 638213 is about 86.0971050254.

The spelling of 638213 in words is "six hundred thirty-eight thousand, two hundred thirteen".