1679749 has 4 divisors (see below), whose sum is σ = 1697164. Its totient is φ = 1662336.

The previous prime is 1679723. The next prime is 1679773. The reversal of 1679749 is 9479761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9479761 = 17 ⋅557633.

It can be written as a sum of positive squares in 2 ways, for example, as 1117249 + 562500 = 1057^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679749 - 2¹⁹ = 1155461 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 7² + 9 + 7² + 4² + 9 .

It is a Duffinian number.

1679749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679779) 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, 8562 + ... + 8755.

It is an arithmetic number, because the mean of its divisors is an integer number (424291).

2^1679749 is an apocalyptic number.

It is an amenable number.

1679749 is a deficient number, since it is larger than the sum of its proper divisors (17415).

1679749 is an equidigital number, since it uses as much as digits as its factorization.

1679749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17414.

The product of its digits is 95256, while the sum is 43.

The square root of 1679749 is about 1296.0513107127. The cubic root of 1679749 is about 118.8725184254.

The spelling of 1679749 in words is "one million, six hundred seventy-nine thousand, seven hundred forty-nine".