1986898381 has 8 divisors (see below), whose sum is σ = 2252354720. Its totient is φ = 1737530352.

The previous prime is 1986898379. The next prime is 1986898391. The reversal of 1986898381 is 1838986891.

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

It is a cyclic number.

It is not a de Polignac number, because 1986898381 - 2¹ = 1986898379 is a prime.

It is a super-2 number, since 2×1986898381² = 7895530352840842322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986898391) 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, 4021815 + ... + 4022308.

It is an arithmetic number, because the mean of its divisors is an integer number (281544340).

Almost surely, 2^1986898381 is an apocalyptic number.

It is an amenable number.

1986898381 is a deficient number, since it is larger than the sum of its proper divisors (265456339).

1986898381 is a wasteful number, since it uses less digits than its factorization.

1986898381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8044155.

The product of its digits is 5971968, while the sum is 61.

The square root of 1986898381 is about 44574.6383159752. The cubic root of 1986898381 is about 1257.1638528832.

The spelling of 1986898381 in words is "one billion, nine hundred eighty-six million, eight hundred ninety-eight thousand, three hundred eighty-one".