1988995686 has 16 divisors (see below), whose sum is σ = 3979475568. Its totient is φ = 662751200.

The previous prime is 1988995627. The next prime is 1988995709. The reversal of 1988995686 is 6865998891.

It is a super-2 number, since 2×1988995686² = 7912207677853221192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1988995686.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 44025 + ... + 76916.

It is an arithmetic number, because the mean of its divisors is an integer number (248717223).

Almost surely, 2^1988995686 is an apocalyptic number.

1988995686 is an abundant number, since it is smaller than the sum of its proper divisors (1990479882).

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

1988995686 is a wasteful number, since it uses less digits than its factorization.

1988995686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123687.

The product of its digits is 67184640, while the sum is 69.

The square root of 1988995686 is about 44598.1578767554. The cubic root of 1988995686 is about 1257.6060376942.

The spelling of 1988995686 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-five thousand, six hundred eighty-six".