3986849491 has 2 divisors, whose sum is σ = 3986849492. Its totient is φ = 3986849490.

The previous prime is 3986849479. The next prime is 3986849551. The reversal of 3986849491 is 1949486893.

It is a weak prime.

It is an emirp because it is prime and its reverse (1949486893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3986849491 - 2¹¹ = 3986847443 is a prime.

It is a super-3 number, since 3×3986849491³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (3986849411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993424745 + 1993424746.

It is an arithmetic number, because the mean of its divisors is an integer number (1993424746).

Almost surely, 2^3986849491 is an apocalyptic number.

3986849491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3986849491 is an equidigital number, since it uses as much as digits as its factorization.

3986849491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 61.

The square root of 3986849491 is about 63141.5037119009. The cubic root of 3986849491 is about 1585.6595477810.

The spelling of 3986849491 in words is "three billion, nine hundred eighty-six million, eight hundred forty-nine thousand, four hundred ninety-one".