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769 is a prime number

769 has 2 divisors, whose sum is σ = 770. Its totient is φ = 768.

The previous prime is 761. The next prime is 773. The reversal of 769 is 967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625 + 144 = 25^2 + 12^2 .

It is an emirp because it is prime and its reverse (967) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 769 - 23 = 761 is a prime.

It is a super-2 number, since 2×7692 = 1182722, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

769 is a lucky number.

It is a plaindrome in base 14.

It is a nialpdrome in base 6 and base 12.

It is not a weakly prime, because it can be changed into another prime (761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a Pierpont prime, being equal to 28 ⋅ 31 + 1.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384 + 385.

It is an arithmetic number, because the mean of its divisors is an integer number (385).

It is a Proth number, since it is equal to 3 ⋅ 28 + 1 and 3 < 28.

It is an amenable number.

769 is a deficient number, since it is larger than the sum of its proper divisors (1).

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

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

The product of its digits is 378, while the sum is 22.

The square root of 769 is about 27.7308492477. The cubic root of 769 is about 9.1616869188.

Subtracting from 769 its sum of digits (22), we obtain a palindrome (747).

The spelling of 769 in words is "seven hundred sixty-nine", and thus it is an aban number and an oban number.