823969 has 2 divisors, whose sum is σ = 823970. Its totient is φ = 823968.

The previous prime is 823967. The next prime is 823981. The reversal of 823969 is 969328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 384400 = 663^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 823969 - 2¹ = 823967 is a prime.

It is a super-2 number, since 2×823969² = 1357849825922, which contains 22 as substring.

Together with 823967, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (823961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411984 + 411985.

It is an arithmetic number, because the mean of its divisors is an integer number (411985).

2⁸²³⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

823969 is a deficient number, since it is larger than the sum of its proper divisors (1).

823969 is an equidigital number, since it uses as much as digits as its factorization.

823969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 823969 is about 907.7273819821. The cubic root of 823969 is about 93.7497872588.

The spelling of 823969 in words is "eight hundred twenty-three thousand, nine hundred sixty-nine".