815923 has 2 divisors, whose sum is σ = 815924. Its totient is φ = 815922.

The previous prime is 815897. The next prime is 815933. The reversal of 815923 is 329518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 815923 - 2⁵ = 815891 is a prime.

It is a super-3 number, since 3×815923³ = 1629554093333206401, which contains 333 as substring.

It is a nialpdrome in base 16.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 815891 and 815900.

It is not a weakly prime, because it can be changed into another prime (815933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407961 + 407962.

It is an arithmetic number, because the mean of its divisors is an integer number (407962).

2⁸¹⁵⁹²³ is an apocalyptic number.

815923 is a deficient number, since it is larger than the sum of its proper divisors (1).

815923 is an equidigital number, since it uses as much as digits as its factorization.

815923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 815923 is about 903.2845620290. The cubic root of 815923 is about 93.4436351829.

It can be divided in two parts, 8 and 15923, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 815923 in words is "eight hundred fifteen thousand, nine hundred twenty-three".