240813 has 12 divisors (see below), whose sum is σ = 361088. Its totient is φ = 160380.

The previous prime is 240811. The next prime is 240829. The reversal of 240813 is 318042.

It is a happy number.

It is not a de Polignac number, because 240813 - 2¹ = 240811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240811) 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 11 ways as a sum of consecutive naturals, for example, 253 + ... + 738.

2²⁴⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

240813 is a deficient number, since it is larger than the sum of its proper divisors (120275).

240813 is an frugal number, since it uses more digits than its factorization.

240813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 994 counting only the distinct ones).

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

The square root of 240813 is about 490.7270116878. The cubic root of 240813 is about 62.2147426998.

Adding to 240813 its reverse (318042), we get a palindrome (558855).

The spelling of 240813 in words is "two hundred forty thousand, eight hundred thirteen".