2089781986 has 8 divisors (see below), whose sum is σ = 3143655900. Its totient is φ = 1041896688.

The previous prime is 2089781977. The next prime is 2089781987. The reversal of 2089781986 is 6891879802.

It can be written as a sum of positive squares in 2 ways, for example, as 1848570025 + 241211961 = 42995^2 + 15531^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2089781986.

It is not an unprimeable number, because it can be changed into a prime (2089781987) 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 3 ways as a sum of consecutive naturals, for example, 1496281 + ... + 1497676.

Almost surely, 2^2089781986 is an apocalyptic number.

2089781986 is a deficient number, since it is larger than the sum of its proper divisors (1053873914).

2089781986 is a wasteful number, since it uses less digits than its factorization.

2089781986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994308.

The product of its (nonzero) digits is 3483648, while the sum is 58.

The square root of 2089781986 is about 45714.1333287639. The cubic root of 2089781986 is about 1278.4988068915.

The spelling of 2089781986 in words is "two billion, eighty-nine million, seven hundred eighty-one thousand, nine hundred eighty-six".