340040400209 has 2 divisors, whose sum is σ = 340040400210. Its totient is φ = 340040400208.

The previous prime is 340040400199. The next prime is 340040400283. The reversal of 340040400209 is 902004040043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305093836609 + 34946563600 = 552353^2 + 186940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340040400209 is a prime.

It is not a weakly prime, because it can be changed into another prime (340040400509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170020200104 + 170020200105.

It is an arithmetic number, because the mean of its divisors is an integer number (170020200105).

Almost surely, 2^340040400209 is an apocalyptic number.

It is an amenable number.

340040400209 is a deficient number, since it is larger than the sum of its proper divisors (1).

340040400209 is an equidigital number, since it uses as much as digits as its factorization.

340040400209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 340040400209 in words is "three hundred forty billion, forty million, four hundred thousand, two hundred nine".