1321967808 has 84 divisors (see below), whose sum is σ = 4330506960. Its totient is φ = 377703936.

The previous prime is 1321967743. The next prime is 1321967827. The reversal of 1321967808 is 8087691231.

It is a tau number, because it is divible by the number of its divisors (84).

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 11 ways as a sum of consecutive naturals, for example, 159903 + ... + 167966.

Almost surely, 2^1321967808 is an apocalyptic number.

1321967808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1321967808 is an abundant number, since it is smaller than the sum of its proper divisors (3008539152).

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

1321967808 is a wasteful number, since it uses less digits than its factorization.

1321967808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327894 (or 327881 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1321967808 is about 36358.8752301278. The cubic root of 1321967808 is about 1097.5061431813.

The spelling of 1321967808 in words is "one billion, three hundred twenty-one million, nine hundred sixty-seven thousand, eight hundred eight".