240783721 has 2 divisors, whose sum is σ = 240783722. Its totient is φ = 240783720.

The previous prime is 240783709. The next prime is 240783731. The reversal of 240783721 is 127387042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226803600 + 13980121 = 15060^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 240783721 - 2⁵ = 240783689 is a prime.

It is not a weakly prime, because it can be changed into another prime (240783731) 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 as a sum of consecutive naturals, namely, 120391860 + 120391861.

It is an arithmetic number, because the mean of its divisors is an integer number (120391861).

Almost surely, 2^240783721 is an apocalyptic number.

It is an amenable number.

240783721 is a deficient number, since it is larger than the sum of its proper divisors (1).

240783721 is an equidigital number, since it uses as much as digits as its factorization.

240783721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 240783721 is about 15517.2072551732. The cubic root of 240783721 is about 622.1222115916.

The spelling of 240783721 in words is "two hundred forty million, seven hundred eighty-three thousand, seven hundred twenty-one".