1281205 has 8 divisors (see below), whose sum is σ = 1627992. Its totient is φ = 964608.

The previous prime is 1281193. The next prime is 1281211. The reversal of 1281205 is 5021821.

It can be written as a sum of positive squares in 4 ways, for example, as 253009 + 1028196 = 503^2 + 1014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281205 - 2⁹ = 1280693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 7452 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (203499).

2^1281205 is an apocalyptic number.

It is an amenable number.

1281205 is a deficient number, since it is larger than the sum of its proper divisors (346787).

1281205 is a wasteful number, since it uses less digits than its factorization.

1281205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15095.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1281205 is about 1131.9032644179. The cubic root of 1281205 is about 108.6107655738.

The spelling of 1281205 in words is "one million, two hundred eighty-one thousand, two hundred five".