1228505 has 16 divisors (see below), whose sum is σ = 1587600. Its totient is φ = 909312.

The previous prime is 1228501. The next prime is 1228519. The reversal of 1228505 is 5058221.

1228505 = 61² + 62² + ... + 157².

It can be written as a sum of positive squares in 8 ways, for example, as 33856 + 1194649 = 184^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228505 - 2² = 1228501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1228501) 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 15 ways as a sum of consecutive naturals, for example, 8171 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (99225).

2^1228505 is an apocalyptic number.

It is an amenable number.

1228505 is a deficient number, since it is larger than the sum of its proper divisors (359095).

1228505 is a wasteful number, since it uses less digits than its factorization.

1228505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1228505 is about 1108.3794476622. The cubic root of 1228505 is about 107.1007000285.

Adding to 1228505 its sum of digits (23), we get a triangular number (1228528 = T₁₅₆₇).

The spelling of 1228505 in words is "one million, two hundred twenty-eight thousand, five hundred five".