1988995856 has 20 divisors (see below), whose sum is σ = 3986565900. Its totient is φ = 960204672.

The previous prime is 1988995807. The next prime is 1988995859. The reversal of 1988995856 is 6585998891.

It can be written as a sum of positive squares in 2 ways, for example, as 347449600 + 1641546256 = 18640^2 + 40516^2 .

It is a super-2 number, since 2×1988995856² = 7912209030370345472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1988995859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142851 + ... + 2143778.

It is an arithmetic number, because the mean of its divisors is an integer number (199328295).

Almost surely, 2^1988995856 is an apocalyptic number.

1988995856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1988995856 is an abundant number, since it is smaller than the sum of its proper divisors (1997570044).

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

1988995856 is a wasteful number, since it uses less digits than its factorization.

1988995856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286666 (or 4286660 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 68.

The square root of 1988995856 is about 44598.1597826637. The cubic root of 1988995856 is about 1257.6060735235.

The spelling of 1988995856 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-five thousand, eight hundred fifty-six".