638830 has 16 divisors (see below), whose sum is σ = 1159344. Its totient is φ = 253440.

The previous prime is 638819. The next prime is 638839. The reversal of 638830 is 38836.

638830 = T₅₀₃ + T₅₀₄ + ... + T₅₀₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638839) by changing a digit.

638830 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, 1765 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (72459).

2⁶³⁸⁸³⁰ is an apocalyptic number.

638830 is a deficient number, since it is larger than the sum of its proper divisors (520514).

638830 is a wasteful number, since it uses less digits than its factorization.

638830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 638830 is about 799.2684154901. The cubic root of 638830 is about 86.1248412222.

The spelling of 638830 in words is "six hundred thirty-eight thousand, eight hundred thirty".