638135 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 469920.

The previous prime is 638123. The next prime is 638147. The reversal of 638135 is 531836.

It is an interprime number because it is at equal distance from previous prime (638123) and next prime (638147).

It is not a de Polignac number, because 638135 - 2¹⁶ = 572599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3476 + ... + 3654.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶³⁸¹³⁵ is an apocalyptic number.

638135 is a deficient number, since it is larger than the sum of its proper divisors (191305).

638135 is a wasteful number, since it uses less digits than its factorization.

638135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238.

The product of its digits is 2160, while the sum is 26.

The square root of 638135 is about 798.8335245844. The cubic root of 638135 is about 86.0935973940.

The spelling of 638135 in words is "six hundred thirty-eight thousand, one hundred thirty-five".