19991683 has 12 divisors (see below), whose sum is σ = 21019824. Its totient is φ = 19009200.

The previous prime is 19991651. The next prime is 19991717. The reversal of 19991683 is 38619991.

It is not a de Polignac number, because 19991683 - 2⁵ = 19991651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19991483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68085 + ... + 68377.

It is an arithmetic number, because the mean of its divisors is an integer number (1751652).

Almost surely, 2^19991683 is an apocalyptic number.

19991683 is a deficient number, since it is larger than the sum of its proper divisors (1028141).

19991683 is an equidigital number, since it uses as much as digits as its factorization.

19991683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 395 counting only the distinct ones).

The product of its digits is 104976, while the sum is 46.

The square root of 19991683 is about 4471.2059894395. The cubic root of 19991683 is about 271.4041300905.

The spelling of 19991683 in words is "nineteen million, nine hundred ninety-one thousand, six hundred eighty-three".