345783217 has 16 divisors (see below), whose sum is σ = 382414032. Its totient is φ = 310625280.

The previous prime is 345783199. The next prime is 345783293. The reversal of 345783217 is 712387543.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9024016 + 336759201 = 3004^2 + 18351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345783217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345783217.

It is not an unprimeable number, because it can be changed into a prime (345783017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403053 + ... + 403909.

It is an arithmetic number, because the mean of its divisors is an integer number (23900877).

Almost surely, 2^345783217 is an apocalyptic number.

It is an amenable number.

345783217 is a deficient number, since it is larger than the sum of its proper divisors (36630815).

345783217 is a wasteful number, since it uses less digits than its factorization.

345783217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

The product of its digits is 141120, while the sum is 40.

The square root of 345783217 is about 18595.2471615733. The cubic root of 345783217 is about 701.8882467810. Note that the first 3 decimals are identical.

The spelling of 345783217 in words is "three hundred forty-five million, seven hundred eighty-three thousand, two hundred seventeen".