1224389 has 2 divisors, whose sum is σ = 1224390. Its totient is φ = 1224388.

The previous prime is 1224347. The next prime is 1224403. The reversal of 1224389 is 9834221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 3364 = 1105^2 + 58^2 .

It is an emirp because it is prime and its reverse (9834221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224389 - 2⁸ = 1224133 is a prime.

It is equal to p₉₄₆₅₅ and since 1224389 and 94655 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224329) 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, 612194 + 612195.

It is an arithmetic number, because the mean of its divisors is an integer number (612195).

2^1224389 is an apocalyptic number.

It is an amenable number.

1224389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224389 is an equidigital number, since it uses as much as digits as its factorization.

1224389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 1224389 is about 1106.5211249678. The cubic root of 1224389 is about 106.9809556463.

The spelling of 1224389 in words is "one million, two hundred twenty-four thousand, three hundred eighty-nine".