19992005 has 8 divisors (see below), whose sum is σ = 26171424. Its totient is φ = 14539600.

The previous prime is 19992001. The next prime is 19992029. The reversal of 19992005 is 50029991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19992005 - 2² = 19992001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19992001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181691 + ... + 181800.

It is an arithmetic number, because the mean of its divisors is an integer number (3271428).

Almost surely, 2^19992005 is an apocalyptic number.

It is an amenable number.

19992005 is a deficient number, since it is larger than the sum of its proper divisors (6179419).

19992005 is a wasteful number, since it uses less digits than its factorization.

19992005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363507.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 19992005 is about 4471.2419974768. The cubic root of 19992005 is about 271.4055872241.

It can be divided in two parts, 1999 and 2005, that added together give a palindrome (4004).

The spelling of 19992005 in words is "nineteen million, nine hundred ninety-two thousand, five".