340710421 has 2 divisors, whose sum is σ = 340710422. Its totient is φ = 340710420.

The previous prime is 340710407. The next prime is 340710443. The reversal of 340710421 is 124017043.

It is an a-pointer prime, because the next prime (340710443) can be obtained adding 340710421 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221682321 + 119028100 = 14889^2 + 10910^2 .

It is a cyclic number.

It is not a de Polignac number, because 340710421 - 2⁵ = 340710389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 340710392 and 340710401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340710521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170355210 + 170355211.

It is an arithmetic number, because the mean of its divisors is an integer number (170355211).

Almost surely, 2^340710421 is an apocalyptic number.

It is an amenable number.

340710421 is a deficient number, since it is larger than the sum of its proper divisors (1).

340710421 is an equidigital number, since it uses as much as digits as its factorization.

340710421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 340710421 is about 18458.3428562805. The cubic root of 340710421 is about 698.4389847550.

Adding to 340710421 its reverse (124017043), we get a palindrome (464727464).

The spelling of 340710421 in words is "three hundred forty million, seven hundred ten thousand, four hundred twenty-one".