1205001273 has 32 divisors (see below), whose sum is σ = 1865318400. Its totient is φ = 677738880.

The previous prime is 1205001271. The next prime is 1205001307. The reversal of 1205001273 is 3721005021.

It is not a de Polignac number, because 1205001273 - 2¹ = 1205001271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1205001271) 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 31 ways as a sum of consecutive naturals, for example, 347653 + ... + 351101.

It is an arithmetic number, because the mean of its divisors is an integer number (58291200).

Almost surely, 2^1205001273 is an apocalyptic number.

It is an amenable number.

1205001273 is a deficient number, since it is larger than the sum of its proper divisors (660317127).

1205001273 is a wasteful number, since it uses less digits than its factorization.

1205001273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3717.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 1205001273 is about 34713.1282514267. The cubic root of 1205001273 is about 1064.1328134400.

Adding to 1205001273 its reverse (3721005021), we get a palindrome (4926006294).

The spelling of 1205001273 in words is "one billion, two hundred five million, one thousand, two hundred seventy-three".