823457 has 2 divisors, whose sum is σ = 823458. Its totient is φ = 823456.

The previous prime is 823451. The next prime is 823481. The reversal of 823457 is 754328.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817216 + 6241 = 904^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 823457 - 2⁸ = 823201 is a prime.

It is not a weakly prime, because it can be changed into another prime (823451) 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 as a sum of consecutive naturals, namely, 411728 + 411729.

It is an arithmetic number, because the mean of its divisors is an integer number (411729).

2⁸²³⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

823457 is a deficient number, since it is larger than the sum of its proper divisors (1).

823457 is an equidigital number, since it uses as much as digits as its factorization.

823457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 823457 is about 907.4453151568. The cubic root of 823457 is about 93.7303650731.

The spelling of 823457 in words is "eight hundred twenty-three thousand, four hundred fifty-seven".