1224405 has 72 divisors (see below), whose sum is σ = 2740608. Its totient is φ = 494208.

The previous prime is 1224403. The next prime is 1224413. The reversal of 1224405 is 5044221.

1224405 = 25² + 26² + ... + 154².

It is not a de Polignac number, because 1224405 - 2¹ = 1224403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224403) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 53224 + ... + 53246.

It is an arithmetic number, because the mean of its divisors is an integer number (38064).

2^1224405 is an apocalyptic number.

1224405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1224405 is an abundant number, since it is smaller than the sum of its proper divisors (1516203).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1224405 is a wasteful number, since it uses less digits than its factorization.

1224405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1224405 is about 1106.5283548107. The cubic root of 1224405 is about 106.9814216441.

Adding to 1224405 its reverse (5044221), we get a palindrome (6268626).

The spelling of 1224405 in words is "one million, two hundred twenty-four thousand, four hundred five".