1921648814 has 8 divisors (see below), whose sum is σ = 2891027568. Its totient is φ = 957972960.

The previous prime is 1921648787. The next prime is 1921648823. The reversal of 1921648814 is 4188461291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 1424882 + ... + 1426229.

It is an arithmetic number, because the mean of its divisors is an integer number (361378446).

Almost surely, 2^1921648814 is an apocalyptic number.

1921648814 is a deficient number, since it is larger than the sum of its proper divisors (969378754).

1921648814 is a wasteful number, since it uses less digits than its factorization.

1921648814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851450.

The product of its digits is 110592, while the sum is 44.

The square root of 1921648814 is about 43836.6149924923. The cubic root of 1921648814 is about 1243.2486817297.

The spelling of 1921648814 in words is "one billion, nine hundred twenty-one million, six hundred forty-eight thousand, eight hundred fourteen".