240744821 has 2 divisors, whose sum is σ = 240744822. Its totient is φ = 240744820.

The previous prime is 240744817. The next prime is 240744929. The reversal of 240744821 is 128447042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214622500 + 26122321 = 14650^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 240744821 - 2² = 240744817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240744811) 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 as a sum of consecutive naturals, namely, 120372410 + 120372411.

It is an arithmetic number, because the mean of its divisors is an integer number (120372411).

Almost surely, 2^240744821 is an apocalyptic number.

It is an amenable number.

240744821 is a deficient number, since it is larger than the sum of its proper divisors (1).

240744821 is an equidigital number, since it uses as much as digits as its factorization.

240744821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 240744821 is about 15515.9537573428. The cubic root of 240744821 is about 622.0887073091.

The spelling of 240744821 in words is "two hundred forty million, seven hundred forty-four thousand, eight hundred twenty-one".