1997797000 has 64 divisors (see below), whose sum is σ = 4718787840. Its totient is φ = 791608000.

The previous prime is 1997796989. The next prime is 1997797001. The reversal of 1997797000 is 7977991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1997797001) 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, 97665 + ... + 116335.

It is an arithmetic number, because the mean of its divisors is an integer number (73731060).

Almost surely, 2^1997797000 is an apocalyptic number.

1997797000 is a gapful number since it is divisible by the number (10) 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 1997797000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2359393920).

1997797000 is an abundant number, since it is smaller than the sum of its proper divisors (2720990840).

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

1997797000 is a wasteful number, since it uses less digits than its factorization.

1997797000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18799 (or 18785 counting only the distinct ones).

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 1997797000 is about 44696.7224749198. The cubic root of 1997797000 is about 1259.4582789270.

The spelling of 1997797000 in words is "one billion, nine hundred ninety-seven million, seven hundred ninety-seven thousand".