1201986684 has 72 divisors (see below), whose sum is σ = 3153346560. Its totient is φ = 385639200.

The previous prime is 1201986677. The next prime is 1201986689. The reversal of 1201986684 is 4866891021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201986689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210337 + ... + 215975.

It is an arithmetic number, because the mean of its divisors is an integer number (43796480).

Almost surely, 2^1201986684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201986684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1576673280).

1201986684 is an abundant number, since it is smaller than the sum of its proper divisors (1951359876).

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

1201986684 is a wasteful number, since it uses less digits than its factorization.

1201986684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871 (or 5866 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1201986684 is about 34669.6796062496. The cubic root of 1201986684 is about 1063.2446810676.

The spelling of 1201986684 in words is "one billion, two hundred one million, nine hundred eighty-six thousand, six hundred eighty-four".