340505999 has 2 divisors, whose sum is σ = 340506000. Its totient is φ = 340505998.

The previous prime is 340505981. The next prime is 340506013. The reversal of 340505999 is 999505043.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340505999 - 2²⁸ = 72070543 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 (340505909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170252999 + 170253000.

It is an arithmetic number, because the mean of its divisors is an integer number (170253000).

Almost surely, 2^340505999 is an apocalyptic number.

340505999 is a deficient number, since it is larger than the sum of its proper divisors (1).

340505999 is an equidigital number, since it uses as much as digits as its factorization.

340505999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 340505999 is about 18452.8046377780. The cubic root of 340505999 is about 698.2992719182.

The spelling of 340505999 in words is "three hundred forty million, five hundred five thousand, nine hundred ninety-nine".