19999039 has 6 divisors (see below), whose sum is σ = 21107400. Its totient is φ = 18946116.

The previous prime is 19999027. The next prime is 19999069. The reversal of 19999039 is 93099991.

It is not a de Polignac number, because 19999039 - 2²¹ = 17901887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19998983 and 19999001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999019) 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 5 ways as a sum of consecutive naturals, for example, 27339 + ... + 28060.

It is an arithmetic number, because the mean of its divisors is an integer number (3517900).

Almost surely, 2^19999039 is an apocalyptic number.

19999039 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19999039 is a deficient number, since it is larger than the sum of its proper divisors (1108361).

19999039 is an equidigital number, since it uses as much as digits as its factorization.

19999039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55437 (or 55418 counting only the distinct ones).

The product of its (nonzero) digits is 177147, while the sum is 49.

The square root of 19999039 is about 4472.0285106426. The cubic root of 19999039 is about 271.4374139976.

The spelling of 19999039 in words is "nineteen million, nine hundred ninety-nine thousand, thirty-nine".