1224664399 has 24 divisors (see below), whose sum is σ = 1518662400. Its totient is φ = 981817200.

The previous prime is 1224664387. The next prime is 1224664421. The reversal of 1224664399 is 9934664221.

It is not a de Polignac number, because 1224664399 - 2⁷ = 1224664271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224664339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65224 + ... + 81874.

It is an arithmetic number, because the mean of its divisors is an integer number (63277600).

Almost surely, 2^1224664399 is an apocalyptic number.

1224664399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1224664399 is a deficient number, since it is larger than the sum of its proper divisors (293998001).

1224664399 is a wasteful number, since it uses less digits than its factorization.

1224664399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16763 (or 16756 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 1224664399 is about 34995.2053715934. The cubic root of 1224664399 is about 1069.8897603840.

The spelling of 1224664399 in words is "one billion, two hundred twenty-four million, six hundred sixty-four thousand, three hundred ninety-nine".