240981 has 16 divisors (see below), whose sum is σ = 357504. Its totient is φ = 143424.

The previous prime is 240967. The next prime is 240997. The reversal of 240981 is 189042.

It is not a de Polignac number, because 240981 - 2⁷ = 240853 is a prime.

It is a super-2 number, since 2×240981² = 116143684722, which contains 22 as substring.

It is a Curzon number.

240981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1360 + ... + 1526.

It is an arithmetic number, because the mean of its divisors is an integer number (22344).

2²⁴⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

240981 is a deficient number, since it is larger than the sum of its proper divisors (116523).

240981 is a wasteful number, since it uses less digits than its factorization.

240981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 240981 is about 490.8981564439. The cubic root of 240981 is about 62.2292071004.

It can be divided in two parts, 240 and 981, that added together give a palindrome (1221).

The spelling of 240981 in words is "two hundred forty thousand, nine hundred eighty-one".