1223999 has 8 divisors (see below), whose sum is σ = 1472640. Its totient is φ = 993816.

The previous prime is 1223993. The next prime is 1224029. The reversal of 1223999 is 9993221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 4734.

It is an arithmetic number, because the mean of its divisors is an integer number (184080).

2^1223999 is an apocalyptic number.

1223999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1223999 is a deficient number, since it is larger than the sum of its proper divisors (248641).

1223999 is an equidigital number, since it uses as much as digits as its factorization.

1223999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229.

The product of its digits is 8748, while the sum is 35.

The square root of 1223999 is about 1106.3448829366. The cubic root of 1223999 is about 106.9695956936.

It can be divided in two parts, 1223 and 999, that added together give a palindrome (2222).

The spelling of 1223999 in words is "one million, two hundred twenty-three thousand, nine hundred ninety-nine".