19983939 has 4 divisors (see below), whose sum is σ = 26645256. Its totient is φ = 13322624.

The previous prime is 19983917. The next prime is 19983947. The reversal of 19983939 is 93938991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19983939 - 2⁵ = 19983907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19983891 and 19983900.

It is not an unprimeable number, because it can be changed into a prime (19983989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3330654 + ... + 3330659.

It is an arithmetic number, because the mean of its divisors is an integer number (6661314).

Almost surely, 2^19983939 is an apocalyptic number.

19983939 is a deficient number, since it is larger than the sum of its proper divisors (6661317).

19983939 is an equidigital number, since it uses as much as digits as its factorization.

19983939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661316.

The product of its digits is 472392, while the sum is 51.

The square root of 19983939 is about 4470.3399199613. The cubic root of 19983939 is about 271.3690817653.

The spelling of 19983939 in words is "nineteen million, nine hundred eighty-three thousand, nine hundred thirty-nine".