1200891188 has 12 divisors (see below), whose sum is σ = 2401782432. Its totient is φ = 514667640.

The previous prime is 1200891187. The next prime is 1200891193. The reversal of 1200891188 is 8811980021.

It is a happy number.

1200891188 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200891187) 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 3 ways as a sum of consecutive naturals, for example, 21444458 + ... + 21444513.

It is an arithmetic number, because the mean of its divisors is an integer number (200148536).

Almost surely, 2^1200891188 is an apocalyptic number.

It is an amenable number.

1200891188 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1200891188 is a wasteful number, since it uses less digits than its factorization.

1200891188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42888982 (or 42888980 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 38.

The square root of 1200891188 is about 34653.8769548228. The cubic root of 1200891188 is about 1062.9215675778.

The spelling of 1200891188 in words is "one billion, two hundred million, eight hundred ninety-one thousand, one hundred eighty-eight".