1997943776 has 48 divisors (see below), whose sum is σ = 4044379248. Its totient is φ = 970982400.

The previous prime is 1997943709. The next prime is 1997943799. The reversal of 1997943776 is 6773497991.

It is a super-3 number, since 3×1997943776³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368606 + ... + 373986.

It is an arithmetic number, because the mean of its divisors is an integer number (84257901).

Almost surely, 2^1997943776 is an apocalyptic number.

1997943776 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 1997943776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2022189624).

1997943776 is an abundant number, since it is smaller than the sum of its proper divisors (2046435472).

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

1997943776 is a wasteful number, since it uses less digits than its factorization.

1997943776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715 (or 5707 counting only the distinct ones).

The product of its digits is 18003384, while the sum is 62.

The square root of 1997943776 is about 44698.3643548620. The cubic root of 1997943776 is about 1259.4891218541.

The spelling of 1997943776 in words is "one billion, nine hundred ninety-seven million, nine hundred forty-three thousand, seven hundred seventy-six".