1200205520 has 40 divisors (see below), whose sum is σ = 2795681184. Its totient is φ = 479187072.

The previous prime is 1200205493. The next prime is 1200205537. The reversal of 1200205520 is 255020021.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30047 + ... + 57473.

Almost surely, 2^1200205520 is an apocalyptic number.

1200205520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200205520 is an abundant number, since it is smaller than the sum of its proper divisors (1595475664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200205520 is a wasteful number, since it uses less digits than its factorization.

1200205520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27987 (or 27981 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 1200205520 is about 34643.9824500591. The cubic root of 1200205520 is about 1062.7192317166.

Adding to 1200205520 its reverse (255020021), we get a palindrome (1455225541).

The spelling of 1200205520 in words is "one billion, two hundred million, two hundred five thousand, five hundred twenty".