1997119992 has 256 divisors, whose sum is σ = 6242457600. Its totient is φ = 520058880.

The previous prime is 1997119991. The next prime is 1997119997. The reversal of 1997119992 is 2999117991.

1997119992 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997119991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8720934 + ... + 8721162.

It is an arithmetic number, because the mean of its divisors is an integer number (24384600).

Almost surely, 2^1997119992 is an apocalyptic number.

1997119992 is a gapful number since it is divisible by the number (12) 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 1997119992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3121228800).

1997119992 is an abundant number, since it is smaller than the sum of its proper divisors (4245337608).

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

1997119992 is a wasteful number, since it uses less digits than its factorization.

1997119992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 362 counting only the distinct ones).

The product of its digits is 826686, while the sum is 57.

The square root of 1997119992 is about 44689.1484814826. The cubic root of 1997119992 is about 1259.3159955912.

The spelling of 1997119992 in words is "one billion, nine hundred ninety-seven million, one hundred nineteen thousand, nine hundred ninety-two".