340446721 has 2 divisors, whose sum is σ = 340446722. Its totient is φ = 340446720.

The previous prime is 340446707. The next prime is 340446737. The reversal of 340446721 is 127644043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320016321 + 20430400 = 17889^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 340446721 - 2⁷ = 340446593 is a prime.

It is not a weakly prime, because it can be changed into another prime (340446751) 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 as a sum of consecutive naturals, namely, 170223360 + 170223361.

It is an arithmetic number, because the mean of its divisors is an integer number (170223361).

Almost surely, 2^340446721 is an apocalyptic number.

It is an amenable number.

340446721 is a deficient number, since it is larger than the sum of its proper divisors (1).

340446721 is an equidigital number, since it uses as much as digits as its factorization.

340446721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 340446721 is about 18451.1983621661. The cubic root of 340446721 is about 698.2587477310.

The spelling of 340446721 in words is "three hundred forty million, four hundred forty-six thousand, seven hundred twenty-one".