638130 has 32 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 167552.

The previous prime is 638123. The next prime is 638147. The reversal of 638130 is 31836.

638130 = T₁₇₀ + T₁₇₁ + ... + T₂₀₅.

It is a junction number, because it is equal to n+sod(n) for n = 638097 and 638106.

It is an unprimeable number.

638130 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 15 ways as a sum of consecutive naturals, for example, 2551 + ... + 2789.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2⁶³⁸¹³⁰ is an apocalyptic number.

638130 is an abundant number, since it is smaller than the sum of its proper divisors (917070).

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

638130 is a wasteful number, since it uses less digits than its factorization.

638130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 638130 is about 798.8303950151. The cubic root of 638130 is about 86.0933725361.

Adding to 638130 its reverse (31836), we get a palindrome (669966).

The spelling of 638130 in words is "six hundred thirty-eight thousand, one hundred thirty".