1679665 has 8 divisors (see below), whose sum is σ = 2170728. Its totient is φ = 1240320.

The previous prime is 1679659. The next prime is 1679669. The reversal of 1679665 is 5669761.

It can be written as a sum of positive squares in 4 ways, for example, as 49 + 1679616 = 7^2 + 1296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1679665 - 2⁵ = 1679633 is a prime.

It is a Duffinian number.

1679665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1679669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12856 + ... + 12985.

It is an arithmetic number, because the mean of its divisors is an integer number (271341).

2^1679665 is an apocalyptic number.

It is an amenable number.

1679665 is a deficient number, since it is larger than the sum of its proper divisors (491063).

1679665 is a wasteful number, since it uses less digits than its factorization.

1679665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25859.

The product of its digits is 68040, while the sum is 40.

The square root of 1679665 is about 1296.0189041831. The cubic root of 1679665 is about 118.8705368877.

It can be divided in two parts, 16796 and 65, that added together give a palindrome (16861).

The spelling of 1679665 in words is "one million, six hundred seventy-nine thousand, six hundred sixty-five".