1790665 has 12 divisors (see below), whose sum is σ = 2249604. Its totient is φ = 1368224.

The previous prime is 1790651. The next prime is 1790669. The reversal of 1790665 is 5660971.

It can be written as a sum of positive squares in 2 ways, for example, as 1375929 + 414736 = 1173^2 + 644^2 .

It is not a de Polignac number, because 1790665 - 2¹⁵ = 1757897 is a prime.

It is a super-2 number, since 2×1790665² = 6412962284450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1790665.

It is not an unprimeable number, because it can be changed into a prime (1790669) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2307 + ... + 2983.

It is an arithmetic number, because the mean of its divisors is an integer number (187467).

2^1790665 is an apocalyptic number.

It is an amenable number.

1790665 is a deficient number, since it is larger than the sum of its proper divisors (458939).

1790665 is an equidigital number, since it uses as much as digits as its factorization.

1790665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 1790665 is about 1338.1573151166. The cubic root of 1790665 is about 121.4333888351.

It can be divided in two parts, 17906 and 65, that added together give a palindrome (17971).

The spelling of 1790665 in words is "one million, seven hundred ninety thousand, six hundred sixty-five".