1205207745 has 32 divisors (see below), whose sum is σ = 2205730560. Its totient is φ = 550471680.

The previous prime is 1205207743. The next prime is 1205207749. The reversal of 1205207745 is 5477025021.

It is not a de Polignac number, because 1205207745 - 2¹ = 1205207743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205207743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134361 + ... + 143049.

It is an arithmetic number, because the mean of its divisors is an integer number (68929080).

Almost surely, 2^1205207745 is an apocalyptic number.

1205207745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1205207745 is a deficient number, since it is larger than the sum of its proper divisors (1000522815).

1205207745 is a wasteful number, since it uses less digits than its factorization.

1205207745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10025.

The product of its (nonzero) digits is 19600, while the sum is 33.

The square root of 1205207745 is about 34716.1020997462. The cubic root of 1205207745 is about 1064.1935882258.

The spelling of 1205207745 in words is "one billion, two hundred five million, two hundred seven thousand, seven hundred forty-five".