18992005 has 8 divisors (see below), whose sum is σ = 22886424. Its totient is φ = 15129600.

The previous prime is 18991981. The next prime is 18992027. The reversal of 18992005 is 50029981.

18992005 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 4726276 + 14265729 = 2174^2 + 3777^2 .

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

It is not a de Polignac number, because 18992005 - 2¹⁹ = 18467717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6676 + ... + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (2860803).

Almost surely, 2^18992005 is an apocalyptic number.

It is an amenable number.

18992005 is a deficient number, since it is larger than the sum of its proper divisors (3894419).

18992005 is a wasteful number, since it uses less digits than its factorization.

18992005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16007.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 18992005 is about 4357.9817576488. The cubic root of 18992005 is about 266.8027317770.

The spelling of 18992005 in words is "eighteen million, nine hundred ninety-two thousand, five".