1224999999 has 24 divisors (see below), whose sum is σ = 1828611200. Its totient is φ = 789419520.

The previous prime is 1224999973. The next prime is 1225000001. The reversal of 1224999999 is 9999994221.

It is a Cunningham number, because it is equal to 35000²-1.

It is not a de Polignac number, because 1224999999 - 2⁵ = 1224999967 is a prime.

It is a Duffinian number.

1224999999 is a modest number, since divided by 99999 gives 12249 as remainder.

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 (1224999929) 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 in 23 ways as a sum of consecutive naturals, for example, 313047 + ... + 316935.

Almost surely, 2^1224999999 is an apocalyptic number.

1224999999 is a deficient number, since it is larger than the sum of its proper divisors (603611201).

1224999999 is a wasteful number, since it uses less digits than its factorization.

1224999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055 (or 5052 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 1224999999 is about 34999.9999857143. Note that the first 4 decimals coincide. The cubic root of 1224999999 is about 1069.9874802739.

It can be divided in two parts, 1 and 224999999, that added together give a square (225000000 = 15000²).

The spelling of 1224999999 in words is "one billion, two hundred twenty-four million, nine hundred ninety-nine thousand, nine hundred ninety-nine".