1921817368 has 32 divisors (see below), whose sum is σ = 3663237600. Its totient is φ = 945084672.

The previous prime is 1921817353. The next prime is 1921817423. The reversal of 1921817368 is 8637181291.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111421 + ... + 127507.

It is an arithmetic number, because the mean of its divisors is an integer number (114476175).

Almost surely, 2^1921817368 is an apocalyptic number.

It is an amenable number.

1921817368 is a deficient number, since it is larger than the sum of its proper divisors (1741420232).

1921817368 is a wasteful number, since it uses less digits than its factorization.

1921817368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16339 (or 16335 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 1921817368 is about 43838.5374756047. The cubic root of 1921817368 is about 1243.2850304476.

The spelling of 1921817368 in words is "one billion, nine hundred twenty-one million, eight hundred seventeen thousand, three hundred sixty-eight".