19949983 has 4 divisors (see below), whose sum is σ = 19969848.
Its totient is φ = 19930120.
The previous prime is 19949977. The next prime is 19950013. The reversal of 19949983 is 38994991.
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 19949983 - 29 = 19949471 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 19949983.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19949933) by changing a digit.
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, 8341 + ... + 10462.
It is an arithmetic number, because the mean of its divisors is an integer number (4992462).
Almost surely, 219949983 is an apocalyptic number.
19949983 is a deficient number, since it is larger than the sum of its proper divisors (19865).
19949983 is a wasteful number, since it uses less digits than its factorization.
19949983 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19864.
The product of its digits is 629856, while the sum is 52.
The square root of 19949983 is about 4466.5403837870.
The cubic root of 19949983 is about 271.2152943910.
The spelling of 19949983 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred eighty-three".