340644649 has 2 divisors, whose sum is σ = 340644650. Its totient is φ = 340644648.

The previous prime is 340644637. The next prime is 340644677. The reversal of 340644649 is 946446043.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203918400 + 136726249 = 14280^2 + 11693^2 .

It is an emirp because it is prime and its reverse (946446043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340644649 - 2⁵ = 340644617 is a prime.

It is not a weakly prime, because it can be changed into another prime (340644049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170322324 + 170322325.

It is an arithmetic number, because the mean of its divisors is an integer number (170322325).

Almost surely, 2^340644649 is an apocalyptic number.

It is an amenable number.

340644649 is a deficient number, since it is larger than the sum of its proper divisors (1).

340644649 is an equidigital number, since it uses as much as digits as its factorization.

340644649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 340644649 is about 18456.5611368965. The cubic root of 340644649 is about 698.3940387809.

The spelling of 340644649 in words is "three hundred forty million, six hundred forty-four thousand, six hundred forty-nine".