1211994800 has 60 divisors (see below), whose sum is σ = 3065090280. Its totient is φ = 459279360.

The previous prime is 1211994739. The next prime is 1211994803. The reversal of 1211994800 is 84991121.

It is not an unprimeable number, because it can be changed into a prime (1211994803) 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 11 ways as a sum of consecutive naturals, for example, 72137 + ... + 87336.

It is an arithmetic number, because the mean of its divisors is an integer number (51084838).

Almost surely, 2^1211994800 is an apocalyptic number.

1211994800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211994800 is an abundant number, since it is smaller than the sum of its proper divisors (1853095480).

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

1211994800 is a wasteful number, since it uses less digits than its factorization.

1211994800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159510 (or 159499 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1211994800 is about 34813.7156879297. The cubic root of 1211994800 is about 1066.1874974529.

The spelling of 1211994800 in words is "one billion, two hundred eleven million, nine hundred ninety-four thousand, eight hundred".