1001221986 has 16 divisors (see below), whose sum is σ = 2107836000. Its totient is φ = 316175328.

The previous prime is 1001221981. The next prime is 1001221999. The reversal of 1001221986 is 6891221001.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1001221981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4391211 + ... + 4391438.

It is an arithmetic number, because the mean of its divisors is an integer number (131739750).

Almost surely, 2^1001221986 is an apocalyptic number.

1001221986 is an abundant number, since it is smaller than the sum of its proper divisors (1106614014).

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

1001221986 is a wasteful number, since it uses less digits than its factorization.

1001221986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8782673.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1001221986 is about 31642.0919978436. The cubic root of 1001221986 is about 1000.4071628626.

Adding to 1001221986 its reverse (6891221001), we get a palindrome (7892442987).

The spelling of 1001221986 in words is "one billion, one million, two hundred twenty-one thousand, nine hundred eighty-six".