235640 has 32 divisors (see below), whose sum is σ = 546480. Its totient is φ = 91392.

The previous prime is 235621. The next prime is 235661. The reversal of 235640 is 46532.

235640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652 + ... + 1788.

2²³⁵⁶⁴⁰ is an apocalyptic number.

235640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 235640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273240).

235640 is an abundant number, since it is smaller than the sum of its proper divisors (310840).

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

235640 is a wasteful number, since it uses less digits than its factorization.

235640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 235640 is about 485.4276465139. The cubic root of 235640 is about 61.7660276272.

The spelling of 235640 in words is "two hundred thirty-five thousand, six hundred forty".