999769 has 2 divisors, whose sum is σ = 999770.
Its totient is φ = 999768.
The previous prime is 999763. The next prime is 999773. The reversal of 999769 is 967999.
It is a happy number.
999769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 974169 + 25600 = 987^2 + 160^2
It is an emirp because it is prime and its reverse (967999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 999769 - 217 = 868697 is a prime.
It is a super-2 number, since 2×9997692 = 1999076106722, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (999763) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499884 + 499885.
It is an arithmetic number, because the mean of its divisors is an integer number (499885).
2999769 is an apocalyptic number.
It is an amenable number.
999769 is a deficient number, since it is larger than the sum of its proper divisors (1).
999769 is an equidigital number, since it uses as much as digits as its factorization.
999769 is an evil number, because the sum of its binary digits is even.
The product of its digits is 275562, while the sum is 49.
The square root of 999769 is about 999.8844933291.
The cubic root of 999769 is about 99.9922994070.
The spelling of 999769 in words is "nine hundred ninety-nine thousand, seven hundred sixty-nine".