1228305 has 16 divisors (see below), whose sum is σ = 2116800. Its totient is φ = 604608.

The previous prime is 1228303. The next prime is 1228309. The reversal of 1228305 is 5038221.

1228305 = T₁₆₁ + T₁₆₂ + ... + T₂₂₅.

It is not a de Polignac number, because 1228305 - 2¹ = 1228303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1228303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2955 + ... + 3344.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

2^1228305 is an apocalyptic number.

1228305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228305 is a deficient number, since it is larger than the sum of its proper divisors (888495).

1228305 is a wasteful number, since it uses less digits than its factorization.

1228305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1228305 is about 1108.2892221798. The cubic root of 1228305 is about 107.0948877330.

The spelling of 1228305 in words is "one million, two hundred twenty-eight thousand, three hundred five".