1991492304984 has 288 divisors, whose sum is σ = 6683263797600. Its totient is φ = 524561356800.

The previous prime is 1991492304973. The next prime is 1991492305001. The reversal of 1991492304984 is 4894032941991.

1991492304984 is a `hidden beast` number, since 19 + 9 + 14 + 92 + 30 + 498 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 68892934 + ... + 68921834.

It is an arithmetic number, because the mean of its divisors is an integer number (23205777075).

Almost surely, 2^{1991492304984} is an apocalyptic number.

1991492304984 is a gapful number since it is divisible by the number (14) 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 1991492304984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3341631898800).

1991492304984 is an abundant number, since it is smaller than the sum of its proper divisors (4691771492616).

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

1991492304984 is a wasteful number, since it uses less digits than its factorization.

1991492304984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29755 (or 29735 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 1991492304984 in words is "one trillion, nine hundred ninety-one billion, four hundred ninety-two million, three hundred four thousand, nine hundred eighty-four".