345305215 has 4 divisors (see below), whose sum is σ = 414366264. Its totient is φ = 276244168.

The previous prime is 345305209. The next prime is 345305251. The reversal of 345305215 is 512503543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512503543 = 10177 ⋅50359.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345305215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34530517 + ... + 34530526.

It is an arithmetic number, because the mean of its divisors is an integer number (103591566).

Almost surely, 2^345305215 is an apocalyptic number.

345305215 is a deficient number, since it is larger than the sum of its proper divisors (69061049).

345305215 is an equidigital number, since it uses as much as digits as its factorization.

345305215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69061048.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 345305215 is about 18582.3899162621. The cubic root of 345305215 is about 701.5646734307.

Adding to 345305215 its reverse (512503543), we get a palindrome (857808758).

The spelling of 345305215 in words is "three hundred forty-five million, three hundred five thousand, two hundred fifteen".