638814 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 193560.

The previous prime is 638801. The next prime is 638819. The reversal of 638814 is 418836.

It is a happy number.

638814 is a modest number, since divided by 814 gives 638 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638819) by changing a digit.

638814 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, 4774 + ... + 4905.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁶³⁸⁸¹⁴ is an apocalyptic number.

638814 is an abundant number, since it is smaller than the sum of its proper divisors (755106).

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

638814 is a wasteful number, since it uses less digits than its factorization.

638814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695.

The product of its digits is 4608, while the sum is 30.

The square root of 638814 is about 799.2584062742. The cubic root of 638814 is about 86.1241221948.

The spelling of 638814 in words is "six hundred thirty-eight thousand, eight hundred fourteen".