1912991668 has 48 divisors (see below), whose sum is σ = 4037017600. Its totient is φ = 774839520.

The previous prime is 1912991651. The next prime is 1912991671. The reversal of 1912991668 is 8661992191.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 229453 + ... + 237643.

Almost surely, 2^1912991668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1912991668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018508800).

1912991668 is an abundant number, since it is smaller than the sum of its proper divisors (2124025932).

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

1912991668 is a wasteful number, since it uses less digits than its factorization.

1912991668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660 (or 8658 counting only the distinct ones).

The product of its digits is 419904, while the sum is 52.

The square root of 1912991668 is about 43737.7602078570. The cubic root of 1912991668 is about 1241.3789005147.

The spelling of 1912991668 in words is "one billion, nine hundred twelve million, nine hundred ninety-one thousand, six hundred sixty-eight".