1921895843040 has 192 divisors, whose sum is σ = 6771185003520. Its totient is φ = 509111308800.

The previous prime is 1921895843027. The next prime is 1921895843081. The reversal of 1921895843040 is 403485981291.

It is a happy number.

1921895843040 is a `hidden beast` number, since 1 + 9 + 2 + 18 + 9 + 584 + 3 + 0 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 820804 + ... + 2125443.

It is an arithmetic number, because the mean of its divisors is an integer number (35266588560).

Almost surely, 2^{1921895843040} is an apocalyptic number.

1921895843040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1921895843040 is an abundant number, since it is smaller than the sum of its proper divisors (4849289160480).

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

1921895843040 is a wasteful number, since it uses less digits than its factorization.

1921895843040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946422 (or 2946408 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 1921895843040 in words is "one trillion, nine hundred twenty-one billion, eight hundred ninety-five million, eight hundred forty-three thousand, forty".