1205478985 has 16 divisors (see below), whose sum is σ = 1483764480. Its totient is φ = 939697920.

The previous prime is 1205478971. The next prime is 1205478991. The reversal of 1205478985 is 5898745021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1205478985 is a prime.

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, 86161 + ... + 99169.

It is an arithmetic number, because the mean of its divisors is an integer number (92735280).

Almost surely, 2^1205478985 is an apocalyptic number.

It is an amenable number.

1205478985 is a deficient number, since it is larger than the sum of its proper divisors (278285495).

1205478985 is a wasteful number, since it uses less digits than its factorization.

1205478985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488.

The product of its (nonzero) digits is 806400, while the sum is 49.

The square root of 1205478985 is about 34720.0084245381. The cubic root of 1205478985 is about 1064.2734168468.

The spelling of 1205478985 in words is "one billion, two hundred five million, four hundred seventy-eight thousand, nine hundred eighty-five".