1208861992 has 16 divisors (see below), whose sum is σ = 2440971540. Its totient is φ = 557936256.

The previous prime is 1208861989. The next prime is 1208862079. The reversal of 1208861992 is 2991688021.

It can be written as a sum of positive squares in 2 ways, for example, as 1186526916 + 22335076 = 34446^2 + 4726^2 .

It is a super-2 number, since 2×1208861992² = 2922694631404416128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5811733 + ... + 5811940.

Almost surely, 2^1208861992 is an apocalyptic number.

It is an amenable number.

1208861992 is an abundant number, since it is smaller than the sum of its proper divisors (1232109548).

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

1208861992 is a wasteful number, since it uses less digits than its factorization.

1208861992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623692 (or 11623688 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1208861992 is about 34768.6926990360. The cubic root of 1208861992 is about 1065.2680647996.

The spelling of 1208861992 in words is "one billion, two hundred eight million, eight hundred sixty-one thousand, nine hundred ninety-two".