1205555730 has 32 divisors (see below), whose sum is σ = 2925849600. Its totient is φ = 317868672.

The previous prime is 1205555717. The next prime is 1205555753. The reversal of 1205555730 is 375555021.

It is a junction number, because it is equal to n+sod(n) for n = 1205555691 and 1205555700.

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, 223090 + ... + 228429.

It is an arithmetic number, because the mean of its divisors is an integer number (91432800).

Almost surely, 2^1205555730 is an apocalyptic number.

1205555730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1205555730 is an abundant number, since it is smaller than the sum of its proper divisors (1720293870).

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

1205555730 is a wasteful number, since it uses less digits than its factorization.

1205555730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451618.

The product of its (nonzero) digits is 26250, while the sum is 33.

The square root of 1205555730 is about 34721.1136054131. The cubic root of 1205555730 is about 1064.2960014878.

The spelling of 1205555730 in words is "one billion, two hundred five million, five hundred fifty-five thousand, seven hundred thirty".