1205242065 has 32 divisors (see below), whose sum is σ = 2159554560. Its totient is φ = 637725312.

The previous prime is 1205242063. The next prime is 1205242097. The reversal of 1205242065 is 5602425021.

It is not a de Polignac number, because 1205242065 - 2¹ = 1205242063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1205242061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18004 + ... + 52293.

It is an arithmetic number, because the mean of its divisors is an integer number (67486080).

Almost surely, 2^1205242065 is an apocalyptic number.

1205242065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205242065 is a deficient number, since it is larger than the sum of its proper divisors (954312495).

1205242065 is a wasteful number, since it uses less digits than its factorization.

1205242065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70438 (or 70432 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1205242065 is about 34716.5963913515. The cubic root of 1205242065 is about 1064.2036896038.

Adding to 1205242065 its reverse (5602425021), we get a palindrome (6807667086).

The spelling of 1205242065 in words is "one billion, two hundred five million, two hundred forty-two thousand, sixty-five".