240243213 has 16 divisors (see below), whose sum is σ = 367690880. Its totient is φ = 136679616.

The previous prime is 240243209. The next prime is 240243247. The reversal of 240243213 is 312342042.

It is not a de Polignac number, because 240243213 - 2² = 240243209 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 240243213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240243253) 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, 20170 + ... + 29787.

It is an arithmetic number, because the mean of its divisors is an integer number (22980680).

Almost surely, 2^240243213 is an apocalyptic number.

It is an amenable number.

240243213 is a deficient number, since it is larger than the sum of its proper divisors (127447667).

240243213 is a wasteful number, since it uses less digits than its factorization.

240243213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50196.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 240243213 is about 15499.7810629699. The cubic root of 240243213 is about 621.6563523586.

Adding to 240243213 its reverse (312342042), we get a palindrome (552585255).

The spelling of 240243213 in words is "two hundred forty million, two hundred forty-three thousand, two hundred thirteen".