345420947 has 2 divisors, whose sum is σ = 345420948. Its totient is φ = 345420946.

The previous prime is 345420913. The next prime is 345420949. The reversal of 345420947 is 749024543.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 345420947 - 2⁶ = 345420883 is a prime.

Together with 345420949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345420947.

It is not a weakly prime, because it can be changed into another prime (345420949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172710473 + 172710474.

It is an arithmetic number, because the mean of its divisors is an integer number (172710474).

Almost surely, 2^345420947 is an apocalyptic number.

345420947 is a deficient number, since it is larger than the sum of its proper divisors (1).

345420947 is an equidigital number, since it uses as much as digits as its factorization.

345420947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 345420947 is about 18585.5036789429. The cubic root of 345420947 is about 701.6430431455.

The spelling of 345420947 in words is "three hundred forty-five million, four hundred twenty thousand, nine hundred forty-seven".