240681 has 16 divisors (see below), whose sum is σ = 374144. Its totient is φ = 134784.

The previous prime is 240677. The next prime is 240701. The reversal of 240681 is 186042.

240681 = T₅₄ + T₅₅ + ... + T₁₁₆.

240681 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 240681 - 2² = 240677 is a prime.

It is a super-2 number, since 2×240681² = 115854687522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (240631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1455 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (23384).

2²⁴⁰⁶⁸¹ is an apocalyptic number.

240681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

240681 is a deficient number, since it is larger than the sum of its proper divisors (133463).

240681 is a wasteful number, since it uses less digits than its factorization.

240681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 240681 is about 490.5924989235. The cubic root of 240681 is about 62.2033730935.

The spelling of 240681 in words is "two hundred forty thousand, six hundred eighty-one".