638085 has 32 divisors (see below), whose sum is σ = 1198080. Its totient is φ = 283968.

The previous prime is 638081. The next prime is 638117. The reversal of 638085 is 580836.

638085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638085 - 2² = 638081 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638085.

It is not an unprimeable number, because it can be changed into a prime (638081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6144 + ... + 6246.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2⁶³⁸⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

638085 is a deficient number, since it is larger than the sum of its proper divisors (559995).

638085 is a wasteful number, since it uses less digits than its factorization.

638085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 638085 is about 798.8022283394. The cubic root of 638085 is about 86.0913487620.

The spelling of 638085 in words is "six hundred thirty-eight thousand, eighty-five".