235840 has 56 divisors (see below), whose sum is σ = 621792. Its totient is φ = 84480.

The previous prime is 235813. The next prime is 235849. The reversal of 235840 is 48532.

235840 = 68² + 69² + ... + 100².

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3487 + ... + 3553.

2²³⁵⁸⁴⁰ is an apocalyptic number.

235840 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 235840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310896).

235840 is an abundant number, since it is smaller than the sum of its proper divisors (385952).

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

235840 is a wasteful number, since it uses less digits than its factorization.

235840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 235840 is about 485.6336067448. The cubic root of 235840 is about 61.7834973724.

The spelling of 235840 in words is "two hundred thirty-five thousand, eight hundred forty".