1224399 has 12 divisors (see below), whose sum is σ = 1794968. Its totient is φ = 741840.

The previous prime is 1224389. The next prime is 1224403. The reversal of 1224399 is 9934221.

It is not a de Polignac number, because 1224399 - 2⁷ = 1224271 is a prime.

It is a super-2 number, since 2×1224399² = 2998305822402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224329) 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 11 ways as a sum of consecutive naturals, for example, 1324 + ... + 2049.

2^1224399 is an apocalyptic number.

1224399 is a deficient number, since it is larger than the sum of its proper divisors (570569).

1224399 is a wasteful number, since it uses less digits than its factorization.

1224399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3398 (or 3387 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 1224399 is about 1106.5256436251. The cubic root of 1224399 is about 106.9812468954.

The spelling of 1224399 in words is "one million, two hundred twenty-four thousand, three hundred ninety-nine".