19681384 has 32 divisors (see below), whose sum is σ = 38041920. Its totient is φ = 9542016.

The previous prime is 19681381. The next prime is 19681429. The reversal of 19681384 is 48318691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19681381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38877 + ... + 39379.

It is an arithmetic number, because the mean of its divisors is an integer number (1188810).

Almost surely, 2^19681384 is an apocalyptic number.

It is an amenable number.

19681384 is a deficient number, since it is larger than the sum of its proper divisors (18360536).

19681384 is a wasteful number, since it uses less digits than its factorization.

19681384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 645 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 19681384 is about 4436.3705886682. The cubic root of 19681384 is about 269.9926106803.

The spelling of 19681384 in words is "nineteen million, six hundred eighty-one thousand, three hundred eighty-four".