240642913 has 4 divisors (see below), whose sum is σ = 275020480. Its totient is φ = 206265348.

The previous prime is 240642889. The next prime is 240642929. The reversal of 240642913 is 319246042.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 319246042 = 2 ⋅159623021.

It is a cyclic number.

It is not a de Polignac number, because 240642913 - 2⁵ = 240642881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240642943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17188773 + ... + 17188786.

It is an arithmetic number, because the mean of its divisors is an integer number (68755120).

Almost surely, 2^240642913 is an apocalyptic number.

It is an amenable number.

240642913 is a deficient number, since it is larger than the sum of its proper divisors (34377567).

240642913 is an equidigital number, since it uses as much as digits as its factorization.

240642913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34377566.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 240642913 is about 15512.6694350134. The cubic root of 240642913 is about 622.0009175863. Note that the first 3 decimals are identical.

Adding to 240642913 its reverse (319246042), we get a palindrome (559888955).

The spelling of 240642913 in words is "two hundred forty million, six hundred forty-two thousand, nine hundred thirteen".