1660345 has 4 divisors (see below), whose sum is σ = 1992420. Its totient is φ = 1328272.

The previous prime is 1660297. The next prime is 1660357. The reversal of 1660345 is 5430661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1236544 + 423801 = 1112^2 + 651^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660345 - 2¹⁷ = 1529273 is a prime.

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, 166030 + ... + 166039.

It is an arithmetic number, because the mean of its divisors is an integer number (498105).

2^1660345 is an apocalyptic number.

It is an amenable number.

1660345 is a deficient number, since it is larger than the sum of its proper divisors (332075).

1660345 is an equidigital number, since it uses as much as digits as its factorization.

1660345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332074.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1660345 is about 1288.5437516825. The cubic root of 1660345 is about 118.4130169293.

The spelling of 1660345 in words is "one million, six hundred sixty thousand, three hundred forty-five".