340420429 has 2 divisors, whose sum is σ = 340420430. Its totient is φ = 340420428.

The previous prime is 340420411. The next prime is 340420439. The reversal of 340420429 is 924024043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336722500 + 3697929 = 18350^2 + 1923^2 .

It is an emirp because it is prime and its reverse (924024043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340420429 - 2²¹ = 338323277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 340420397 and 340420406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340420439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170210214 + 170210215.

It is an arithmetic number, because the mean of its divisors is an integer number (170210215).

Almost surely, 2^340420429 is an apocalyptic number.

It is an amenable number.

340420429 is a deficient number, since it is larger than the sum of its proper divisors (1).

340420429 is an equidigital number, since it uses as much as digits as its factorization.

340420429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 340420429 is about 18450.4858743611. The cubic root of 340420429 is about 698.2407722393.

The spelling of 340420429 in words is "three hundred forty million, four hundred twenty thousand, four hundred twenty-nine".