340540399 has 2 divisors, whose sum is σ = 340540400. Its totient is φ = 340540398.

The previous prime is 340540397. The next prime is 340540463. The reversal of 340540399 is 993045043.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340540399 - 2¹ = 340540397 is a prime.

Together with 340540397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340540391) 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, 170270199 + 170270200.

It is an arithmetic number, because the mean of its divisors is an integer number (170270200).

Almost surely, 2^340540399 is an apocalyptic number.

340540399 is a deficient number, since it is larger than the sum of its proper divisors (1).

340540399 is an equidigital number, since it uses as much as digits as its factorization.

340540399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 340540399 is about 18453.7367218675. The cubic root of 340540399 is about 698.3227866151.

The spelling of 340540399 in words is "three hundred forty million, five hundred forty thousand, three hundred ninety-nine".