340555993 has 2 divisors, whose sum is σ = 340555994. Its totient is φ = 340555992.

The previous prime is 340555991. The next prime is 340556071. The reversal of 340555993 is 399555043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337199769 + 3356224 = 18363^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 340555993 - 2¹ = 340555991 is a prime.

Together with 340555991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (340555991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170277996 + 170277997.

It is an arithmetic number, because the mean of its divisors is an integer number (170277997).

Almost surely, 2^340555993 is an apocalyptic number.

It is an amenable number.

340555993 is a deficient number, since it is larger than the sum of its proper divisors (1).

340555993 is an equidigital number, since it uses as much as digits as its factorization.

340555993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 364500, while the sum is 43.

The square root of 340555993 is about 18454.1592330835. The cubic root of 340555993 is about 698.3334456336. Note that the first 3 decimals are identical.

The spelling of 340555993 in words is "three hundred forty million, five hundred fifty-five thousand, nine hundred ninety-three".