1205540045 has 16 divisors (see below), whose sum is σ = 1502402880. Its totient is φ = 927932544.

The previous prime is 1205540041. The next prime is 1205540047. The reversal of 1205540045 is 5400455021.

It is a cyclic number.

It is not a de Polignac number, because 1205540045 - 2² = 1205540041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205539996 and 1205540023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205540041) 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, 27440 + ... + 56249.

It is an arithmetic number, because the mean of its divisors is an integer number (93900180).

Almost surely, 2^1205540045 is an apocalyptic number.

It is an amenable number.

1205540045 is a deficient number, since it is larger than the sum of its proper divisors (296862835).

1205540045 is an equidigital number, since it uses as much as digits as its factorization.

1205540045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83804.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 1205540045 is about 34720.8877334667. The cubic root of 1205540045 is about 1064.2913857589.

Adding to 1205540045 its reverse (5400455021), we get a palindrome (6605995066).

The spelling of 1205540045 in words is "one billion, two hundred five million, five hundred forty thousand, forty-five".