1821705403392 has 1408 divisors, whose sum is σ = 6886535086080. Its totient is φ = 463743221760.

The previous prime is 1821705403373. The next prime is 1821705403417. The reversal of 1821705403392 is 2933045071281.

It is a happy number.

1821705403392 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 70 + 540 + 3 + 39 + 2 = 666.

It is a super-2 number, since 2×1821705403392² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5405653848 + ... + 5405654184.

Almost surely, 2^{1821705403392} is an apocalyptic number.

1821705403392 is a gapful number since it is divisible by the number (12) 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 1821705403392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3443267543040).

1821705403392 is an abundant number, since it is smaller than the sum of its proper divisors (5064829682688).

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

1821705403392 is a wasteful number, since it uses less digits than its factorization.

1821705403392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 1821705403392 in words is "one trillion, eight hundred twenty-one billion, seven hundred five million, four hundred three thousand, three hundred ninety-two".