1205605605 has 16 divisors (see below), whose sum is σ = 2012837760. Its totient is φ = 615033408.

The previous prime is 1205605553. The next prime is 1205605673. The reversal of 1205605605 is 5065065021.

It is not a de Polignac number, because 1205605605 - 2⁷ = 1205605477 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746910 + ... + 1747599.

It is an arithmetic number, because the mean of its divisors is an integer number (125802360).

Almost surely, 2^1205605605 is an apocalyptic number.

1205605605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205605605 is a deficient number, since it is larger than the sum of its proper divisors (807232155).

1205605605 is a wasteful number, since it uses less digits than its factorization.

1205605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494540.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1205605605 is about 34721.8318209164. The cubic root of 1205605605 is about 1064.3106782685.

The spelling of 1205605605 in words is "one billion, two hundred five million, six hundred five thousand, six hundred five".