1205042105 has 32 divisors (see below), whose sum is σ = 1553105664. Its totient is φ = 895378176.

The previous prime is 1205042077. The next prime is 1205042117. The reversal of 1205042105 is 5012405021.

It is a cyclic number.

It is not a de Polignac number, because 1205042105 - 2²⁰ = 1203993529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973547 + ... + 974783.

It is an arithmetic number, because the mean of its divisors is an integer number (48534552).

Almost surely, 2^1205042105 is an apocalyptic number.

It is an amenable number.

1205042105 is a deficient number, since it is larger than the sum of its proper divisors (348063559).

1205042105 is a wasteful number, since it uses less digits than its factorization.

1205042105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1205042105 is about 34713.7163812808. The cubic root of 1205042105 is about 1064.1448328410.

Adding to 1205042105 its reverse (5012405021), we get a palindrome (6217447126).

The spelling of 1205042105 in words is "one billion, two hundred five million, forty-two thousand, one hundred five".