1321776000 has 384 divisors, whose sum is σ = 4852841760. Its totient is φ = 344678400.

The previous prime is 1321775989. The next prime is 1321776019. The reversal of 1321776000 is 6771231.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9647932 + ... + 9648068.

Almost surely, 2^1321776000 is an apocalyptic number.

1321776000 is a gapful number since it is divisible by the number (10) 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 1321776000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2426420880).

1321776000 is an abundant number, since it is smaller than the sum of its proper divisors (3531065760).

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

1321776000 is a wasteful number, since it uses less digits than its factorization.

1321776000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 1321776000 is about 36356.2374290850. The cubic root of 1321776000 is about 1097.4530605371.

The spelling of 1321776000 in words is "one billion, three hundred twenty-one million, seven hundred seventy-six thousand".