17990005 has 16 divisors (see below), whose sum is σ = 24364800. Its totient is φ = 12631360.

The previous prime is 17989999. The next prime is 17990009. The reversal of 17990005 is 50009971.

It is not a de Polignac number, because 17990005 - 2⁹ = 17989493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17990009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4045 + ... + 7234.

It is an arithmetic number, because the mean of its divisors is an integer number (1522800).

Almost surely, 2^17990005 is an apocalyptic number.

It is an amenable number.

17990005 is a deficient number, since it is larger than the sum of its proper divisors (6374795).

17990005 is a wasteful number, since it uses less digits than its factorization.

17990005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11324.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 17990005 is about 4241.4626015091. The cubic root of 17990005 is about 262.0256224577.

Adding to 17990005 its reverse (50009971), we get a palindrome (67999976).

The spelling of 17990005 in words is "seventeen million, nine hundred ninety thousand, five".