240540257 has 2 divisors, whose sum is σ = 240540258. Its totient is φ = 240540256.

The previous prime is 240540229. The next prime is 240540271. The reversal of 240540257 is 752045042.

It is a happy number.

240540257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 118570321 = 11044^2 + 10889^2 .

It is a cyclic number.

It is not a de Polignac number, because 240540257 - 2⁶ = 240540193 is a prime.

It is not a weakly prime, because it can be changed into another prime (240540457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120270128 + 120270129.

It is an arithmetic number, because the mean of its divisors is an integer number (120270129).

Almost surely, 2^240540257 is an apocalyptic number.

It is an amenable number.

240540257 is a deficient number, since it is larger than the sum of its proper divisors (1).

240540257 is an equidigital number, since it uses as much as digits as its factorization.

240540257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 240540257 is about 15509.3603027333. The cubic root of 240540257 is about 621.9124584290.

Adding to 240540257 its reverse (752045042), we get a palindrome (992585299).

The spelling of 240540257 in words is "two hundred forty million, five hundred forty thousand, two hundred fifty-seven".