1997807219240 has 64 divisors (see below), whose sum is σ = 5439407904000. Its totient is φ = 644670563328.

The previous prime is 1997807219207. The next prime is 1997807219267. The reversal of 1997807219240 is 429127087991.

It is a super-2 number, since 2×1997807219240² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1997807219240.

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 15 ways as a sum of consecutive naturals, for example, 209848940 + ... + 209858459.

It is an arithmetic number, because the mean of its divisors is an integer number (84990748500).

Almost surely, 2^{1997807219240} is an apocalyptic number.

1997807219240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997807219240 is an abundant number, since it is smaller than the sum of its proper divisors (3441600684760).

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

1997807219240 is a wasteful number, since it uses less digits than its factorization.

1997807219240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419707434 (or 419707430 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 1997807219240 in words is "one trillion, nine hundred ninety-seven billion, eight hundred seven million, two hundred nineteen thousand, two hundred forty".