345215 has 16 divisors (see below), whose sum is σ = 459648. Its totient is φ = 247296.

The previous prime is 345193. The next prime is 345221. The reversal of 345215 is 512543.

345215 = T₂₀₇ + T₂₀₈ + ... + T₂₂₁.

It is a cyclic number.

It is not a de Polignac number, because 345215 - 2⁸ = 344959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2999 + ... + 3111.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2³⁴⁵²¹⁵ is an apocalyptic number.

345215 is a deficient number, since it is larger than the sum of its proper divisors (114433).

345215 is a wasteful number, since it uses less digits than its factorization.

345215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178.

The product of its digits is 600, while the sum is 20.

The square root of 345215 is about 587.5499978725. The cubic root of 345215 is about 70.1503570801.

Adding to 345215 its reverse (512543), we get a palindrome (857758).

It can be divided in two parts, 34 and 5215, that multiplied together give a triangular number (177310 = T₅₉₅).

The spelling of 345215 in words is "three hundred forty-five thousand, two hundred fifteen".