1997795856 has 120 divisors (see below), whose sum is σ = 6017469024. Its totient is φ = 569479680.

The previous prime is 1997795827. The next prime is 1997795881. The reversal of 1997795856 is 6585977991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1511676 + ... + 1512996.

Almost surely, 2^1997795856 is an apocalyptic number.

1997795856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997795856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3008734512).

1997795856 is an abundant number, since it is smaller than the sum of its proper divisors (4019673168).

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

1997795856 is a wasteful number, since it uses less digits than its factorization.

1997795856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1976 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 66.

The square root of 1997795856 is about 44696.7096775590. The cubic root of 1997795856 is about 1259.4580385255.

The spelling of 1997795856 in words is "one billion, nine hundred ninety-seven million, seven hundred ninety-five thousand, eight hundred fifty-six".