1990391866992 has 80 divisors (see below), whose sum is σ = 5713457767680. Its totient is φ = 663429590208.

The previous prime is 1990391866919. The next prime is 1990391867071. The reversal of 1990391866992 is 2996681930991.

It is a happy number.

1990391866992 is a `hidden beast` number, since 1 + 9 + 90 + 391 + 8 + 6 + 69 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 1990391866992.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9044053 + ... + 9261515.

It is an arithmetic number, because the mean of its divisors is an integer number (71418222096).

Almost surely, 2^{1990391866992} is an apocalyptic number.

1990391866992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1990391866992 is an abundant number, since it is smaller than the sum of its proper divisors (3723065900688).

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

1990391866992 is a wasteful number, since it uses less digits than its factorization.

1990391866992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238667 (or 238655 counting only the distinct ones).

The product of its (nonzero) digits is 102036672, while the sum is 72.

The spelling of 1990391866992 in words is "one trillion, nine hundred ninety billion, three hundred ninety-one million, eight hundred sixty-six thousand, nine hundred ninety-two".