638126 has 8 divisors (see below), whose sum is σ = 963984. Its totient is φ = 316800.

The previous prime is 638123. The next prime is 638147. The reversal of 638126 is 621836.

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

It is a junction number, because it is equal to n+sod(n) for n = 638095 and 638104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755 + ... + 1358.

It is an arithmetic number, because the mean of its divisors is an integer number (120498).

2⁶³⁸¹²⁶ is an apocalyptic number.

638126 is a deficient number, since it is larger than the sum of its proper divisors (325858).

638126 is a wasteful number, since it uses less digits than its factorization.

638126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266.

The product of its digits is 1728, while the sum is 26.

The square root of 638126 is about 798.8278913508. The cubic root of 638126 is about 86.0931926489.

Subtracting from 638126 its reverse (621836), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 638126 in words is "six hundred thirty-eight thousand, one hundred twenty-six".