240440721 has 4 divisors (see below), whose sum is σ = 320587632. Its totient is φ = 160293812.

The previous prime is 240440699. The next prime is 240440729. The reversal of 240440721 is 127044042.

240440721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 240440721 - 2⁹ = 240440209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240440691 and 240440700.

It is not an unprimeable number, because it can be changed into a prime (240440729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40073451 + ... + 40073456.

It is an arithmetic number, because the mean of its divisors is an integer number (80146908).

Almost surely, 2^240440721 is an apocalyptic number.

It is an amenable number.

240440721 is a deficient number, since it is larger than the sum of its proper divisors (80146911).

240440721 is an equidigital number, since it uses as much as digits as its factorization.

240440721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80146910.

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 240440721 is about 15506.1510698174. The cubic root of 240440721 is about 621.8266637548.

Adding to 240440721 its reverse (127044042), we get a palindrome (367484763).

The spelling of 240440721 in words is "two hundred forty million, four hundred forty thousand, seven hundred twenty-one".