1345217 has 4 divisors (see below), whose sum is σ = 1347540. Its totient is φ = 1342896.

The previous prime is 1345207. The next prime is 1345229. The reversal of 1345217 is 7125431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36481 + 1308736 = 191^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345217 - 2⁶ = 1345153 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1345192 and 1345201.

It is not an unprimeable number, because it can be changed into a prime (1345207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (336885).

2^1345217 is an apocalyptic number.

It is an amenable number.

1345217 is a deficient number, since it is larger than the sum of its proper divisors (2323).

1345217 is a wasteful number, since it uses less digits than its factorization.

1345217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its digits is 840, while the sum is 23.

The square root of 1345217 is about 1159.8349020443. The cubic root of 1345217 is about 110.3902666365.

The spelling of 1345217 in words is "one million, three hundred forty-five thousand, two hundred seventeen".