1205705904 has 80 divisors (see below), whose sum is σ = 3417718752. Its totient is φ = 363976704.

The previous prime is 1205705903. The next prime is 1205705923. The reversal of 1205705904 is 4095075021.

It is not an unprimeable number, because it can be changed into a prime (1205705903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14844 + ... + 51300.

Almost surely, 2^1205705904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1205705904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708859376).

1205705904 is an abundant number, since it is smaller than the sum of its proper divisors (2212012848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1205705904 is a wasteful number, since it uses less digits than its factorization.

1205705904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36534 (or 36528 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1205705904 is about 34723.2761127172. The cubic root of 1205705904 is about 1064.3401921593.

The spelling of 1205705904 in words is "one billion, two hundred five million, seven hundred five thousand, nine hundred four".