340307861 has 2 divisors, whose sum is σ = 340307862. Its totient is φ = 340307860.

The previous prime is 340307857. The next prime is 340307867. The reversal of 340307861 is 168703043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308880625 + 31427236 = 17575^2 + 5606^2 .

It is an emirp because it is prime and its reverse (168703043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340307861 - 2² = 340307857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340307867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170153930 + 170153931.

It is an arithmetic number, because the mean of its divisors is an integer number (170153931).

Almost surely, 2^340307861 is an apocalyptic number.

It is an amenable number.

340307861 is a deficient number, since it is larger than the sum of its proper divisors (1).

340307861 is an equidigital number, since it uses as much as digits as its factorization.

340307861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 340307861 is about 18447.4350791648. The cubic root of 340307861 is about 698.1638005246.

The spelling of 340307861 in words is "three hundred forty million, three hundred seven thousand, eight hundred sixty-one".