1155823 has 2 divisors, whose sum is σ = 1155824. Its totient is φ = 1155822.

The previous prime is 1155821. The next prime is 1155829. The reversal of 1155823 is 3285511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155823 - 2¹ = 1155821 is a prime.

Together with 1155821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577911 + 577912.

It is an arithmetic number, because the mean of its divisors is an integer number (577912).

2^1155823 is an apocalyptic number.

1155823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155823 is an equidigital number, since it uses as much as digits as its factorization.

1155823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 25.

The square root of 1155823 is about 1075.0920890789. The cubic root of 1155823 is about 104.9454894685.

The spelling of 1155823 in words is "one million, one hundred fifty-five thousand, eight hundred twenty-three".