1986608457 has 16 divisors (see below), whose sum is σ = 3116249280. Its totient is φ = 1246499136.

The previous prime is 1986608413. The next prime is 1986608473. The reversal of 1986608457 is 7548066891.

It is not a de Polignac number, because 1986608457 - 2¹¹ = 1986606409 is a prime.

It is a super-2 number, since 2×1986608457² = 7893226322847841698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1986608857) 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 15 ways as a sum of consecutive naturals, for example, 2163603 + ... + 2164520.

It is an arithmetic number, because the mean of its divisors is an integer number (194765580).

Almost surely, 2^1986608457 is an apocalyptic number.

1986608457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1986608457 is a deficient number, since it is larger than the sum of its proper divisors (1129640823).

1986608457 is a wasteful number, since it uses less digits than its factorization.

1986608457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328149 (or 4328143 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1986608457 is about 44571.3860789633. The cubic root of 1986608457 is about 1257.1027023473.

The spelling of 1986608457 in words is "one billion, nine hundred eighty-six million, six hundred eight thousand, four hundred fifty-seven".