1997111870400 has 168 divisors, whose sum is σ = 6631134580224. Its totient is φ = 526146636800.

The previous prime is 1997111870321. The next prime is 1997111870437. The reversal of 1997111870400 is 40781117991.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1997111870400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2108016 + ... + 2904815.

It is an arithmetic number, because the mean of its divisors is an integer number (39471039168).

Almost surely, 2^{1997111870400} is an apocalyptic number.

1997111870400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997111870400 is an abundant number, since it is smaller than the sum of its proper divisors (4634022709824).

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

1997111870400 is a wasteful number, since it uses less digits than its factorization.

1997111870400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012939 (or 5012924 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 48.

The spelling of 1997111870400 in words is "one trillion, nine hundred ninety-seven billion, one hundred eleven million, eight hundred seventy thousand, four hundred".