1769 has 4 divisors (see below), whose sum is σ = 1860. Its totient is φ = 1680.

The previous prime is 1759. The next prime is 1777. The reversal of 1769 is 9671.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9671 = 19 ⋅509.

It can be written as a sum of positive squares in 2 ways, for example, as 400 + 1369 = 20^2 + 37^2 .

It is a cyclic number.

It is not a de Polignac number, because 1769 - 2⁴ = 1753 is a prime.

It is a super-2 number, since 2×1769² = 6258722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11 and base 15.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2 + ... + 59.

It is an arithmetic number, because the mean of its divisors is an integer number (465).

2¹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

1769 is a deficient number, since it is larger than the sum of its proper divisors (91).

1769 is an equidigital number, since it uses as much as digits as its factorization.

1769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90.

The product of its digits is 378, while the sum is 23.

The square root of 1769 is about 42.0594816896. The cubic root of 1769 is about 12.0941665299.

The spelling of 1769 in words is "one thousand, seven hundred sixty-nine".