1228005 has 24 divisors (see below), whose sum is σ = 2204280. Its totient is φ = 631680.

The previous prime is 1228001. The next prime is 1228009. The reversal of 1228005 is 5008221.

It is an interprime number because it is at equal distance from previous prime (1228001) and next prime (1228009).

It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 1046529 = 426^2 + 1023^2 .

It is not a de Polignac number, because 1228005 - 2² = 1228001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 835 + ... + 1775.

It is an arithmetic number, because the mean of its divisors is an integer number (91845).

2^1228005 is an apocalyptic number.

1228005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228005 is a deficient number, since it is larger than the sum of its proper divisors (976275).

1228005 is a wasteful number, since it uses less digits than its factorization.

1228005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1228005 is about 1108.1538701823. The cubic root of 1228005 is about 107.0861681065.

The spelling of 1228005 in words is "one million, two hundred twenty-eight thousand, five".