253823 has 2 divisors, whose sum is σ = 253824. Its totient is φ = 253822.

The previous prime is 253819. The next prime is 253853. The reversal of 253823 is 328352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253823 - 2² = 253819 is a prime.

It is a super-2 number, since 2×253823² = 128852230658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126911 + 126912.

It is an arithmetic number, because the mean of its divisors is an integer number (126912).

2²⁵³⁸²³ is an apocalyptic number.

253823 is a deficient number, since it is larger than the sum of its proper divisors (1).

253823 is an equidigital number, since it uses as much as digits as its factorization.

253823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 253823 is about 503.8084953631. The cubic root of 253823 is about 63.3155413242.

Subtracting 253823 from its reverse (328352), we obtain a square (74529 = 273²).

The spelling of 253823 in words is "two hundred fifty-three thousand, eight hundred twenty-three".