343640449 has 2 divisors, whose sum is σ = 343640450. Its totient is φ = 343640448.

The previous prime is 343640417. The next prime is 343640467. The reversal of 343640449 is 944046343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195580225 + 148060224 = 13985^2 + 12168^2 .

It is an emirp because it is prime and its reverse (944046343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343640449 - 2⁵ = 343640417 is a prime.

It is not a weakly prime, because it can be changed into another prime (343640149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171820224 + 171820225.

It is an arithmetic number, because the mean of its divisors is an integer number (171820225).

Almost surely, 2^343640449 is an apocalyptic number.

It is an amenable number.

343640449 is a deficient number, since it is larger than the sum of its proper divisors (1).

343640449 is an equidigital number, since it uses as much as digits as its factorization.

343640449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 343640449 is about 18537.5416115514. The cubic root of 343640449 is about 700.4354087061.

The spelling of 343640449 in words is "three hundred forty-three million, six hundred forty thousand, four hundred forty-nine".