1200205215 has 64 divisors (see below), whose sum is σ = 2332915200. Its totient is φ = 580608000.

The previous prime is 1200205211. The next prime is 1200205217. The reversal of 1200205215 is 5125020021.

1200205215 is a `hidden beast` number, since 120 + 0 + 20 + 521 + 5 = 666.

It is not a de Polignac number, because 1200205215 - 2² = 1200205211 is a prime.

It is a super-2 number, since 2×1200205215² = 2880985116226392450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200205211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1141440 + ... + 1142490.

It is an arithmetic number, because the mean of its divisors is an integer number (36451800).

Almost surely, 2^1200205215 is an apocalyptic number.

1200205215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1200205215 is a deficient number, since it is larger than the sum of its proper divisors (1132709985).

1200205215 is a wasteful number, since it uses less digits than its factorization.

1200205215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1200205215 is about 34643.9780481399. The cubic root of 1200205215 is about 1062.7191416960.

Adding to 1200205215 its reverse (5125020021), we get a palindrome (6325225236).

The spelling of 1200205215 in words is "one billion, two hundred million, two hundred five thousand, two hundred fifteen".