1123999 has 2 divisors, whose sum is σ = 1124000. Its totient is φ = 1123998.

The previous prime is 1123979. The next prime is 1124027. The reversal of 1123999 is 9993211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123999 - 2⁹ = 1123487 is a prime.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123909) 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, 561999 + 562000.

It is an arithmetic number, because the mean of its divisors is an integer number (562000).

2^1123999 is an apocalyptic number.

1123999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123999 is an equidigital number, since it uses as much as digits as its factorization.

1123999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 34.

The square root of 1123999 is about 1060.1881908416. The cubic root of 1123999 is about 103.9733351264.

The spelling of 1123999 in words is "one million, one hundred twenty-three thousand, nine hundred ninety-nine".