240320721 has 64 divisors (see below), whose sum is σ = 383201280. Its totient is φ = 132802560.

The previous prime is 240320719. The next prime is 240320741. The reversal of 240320721 is 127023042.

It is not a de Polignac number, because 240320721 - 2¹ = 240320719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240320741) 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 63 ways as a sum of consecutive naturals, for example, 913636 + ... + 913898.

It is an arithmetic number, because the mean of its divisors is an integer number (5987520).

Almost surely, 2^240320721 is an apocalyptic number.

It is an amenable number.

240320721 is a deficient number, since it is larger than the sum of its proper divisors (142880559).

240320721 is a wasteful number, since it uses less digits than its factorization.

240320721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 240320721 is about 15502.2811547204. The cubic root of 240320721 is about 621.7231987282.

Adding to 240320721 its reverse (127023042), we get a palindrome (367343763).

The spelling of 240320721 in words is "two hundred forty million, three hundred twenty thousand, seven hundred twenty-one".