235638 has 48 divisors (see below), whose sum is σ = 589680. Its totient is φ = 67392.

The previous prime is 235621. The next prime is 235661. The reversal of 235638 is 836532.

235638 is a `hidden beast` number, since 23 + 5 + 638 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (4320) is a multiple of the sum of its prime divisors (90).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

235638 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 23 ways as a sum of consecutive naturals, for example, 4420 + ... + 4472.

It is an arithmetic number, because the mean of its divisors is an integer number (12285).

2²³⁵⁶³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 235638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294840).

235638 is an abundant number, since it is smaller than the sum of its proper divisors (354042).

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

235638 is a wasteful number, since it uses less digits than its factorization.

235638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 90 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 235638 is about 485.4255864703. The cubic root of 235638 is about 61.7658528799.

The spelling of 235638 in words is "two hundred thirty-five thousand, six hundred thirty-eight".