240400243 has 2 divisors, whose sum is σ = 240400244. Its totient is φ = 240400242.

The previous prime is 240400231. The next prime is 240400283. The reversal of 240400243 is 342004042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240400243 - 2¹⁷ = 240269171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240400243.

It is not a weakly prime, because it can be changed into another prime (240400283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120200121 + 120200122.

It is an arithmetic number, because the mean of its divisors is an integer number (120200122).

Almost surely, 2^240400243 is an apocalyptic number.

240400243 is a deficient number, since it is larger than the sum of its proper divisors (1).

240400243 is an equidigital number, since it uses as much as digits as its factorization.

240400243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 240400243 is about 15504.8457909132. The cubic root of 240400243 is about 621.7917671253.

Adding to 240400243 its reverse (342004042), we get a palindrome (582404285).

The spelling of 240400243 in words is "two hundred forty million, four hundred thousand, two hundred forty-three".