1215061200 has 90 divisors (see below), whose sum is σ = 4216612374. Its totient is φ = 324015360.

The previous prime is 1215061193. The next prime is 1215061201. The reversal of 1215061200 is 21605121.

1215061200 is a `hidden beast` number, since 1 + 2 + 1 + 50 + 612 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 198471744 + 1016589456 = 14088^2 + 31884^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215061201) 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 17 ways as a sum of consecutive naturals, for example, 165159 + ... + 172358.

Almost surely, 2^1215061200 is an apocalyptic number.

1215061200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215061200 is an abundant number, since it is smaller than the sum of its proper divisors (3001551174).

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

1215061200 is a wasteful number, since it uses less digits than its factorization.

1215061200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337541 (or 337527 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1215061200 is about 34857.7279810374. The cubic root of 1215061200 is about 1067.0859072495.

Adding to 1215061200 its reverse (21605121), we get a palindrome (1236666321).

The spelling of 1215061200 in words is "one billion, two hundred fifteen million, sixty-one thousand, two hundred".