240381 has 16 divisors (see below), whose sum is σ = 369600. Its totient is φ = 154224.

The previous prime is 240379. The next prime is 240421. The reversal of 240381 is 183042.

It is a happy number.

It is not a de Polignac number, because 240381 - 2¹ = 240379 is a prime.

It is a super-2 number, since 2×240381² = 115566050322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630 + ... + 936.

It is an arithmetic number, because the mean of its divisors is an integer number (23100).

2²⁴⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

240381 is a deficient number, since it is larger than the sum of its proper divisors (129219).

240381 is a wasteful number, since it uses less digits than its factorization.

240381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 240381 is about 490.2866508483. The cubic root of 240381 is about 62.1775176102.

The spelling of 240381 in words is "two hundred forty thousand, three hundred eighty-one".