198023005 has 8 divisors (see below), whose sum is σ = 238512600. Its totient is φ = 157828416.

The previous prime is 198023003. The next prime is 198023027. The reversal of 198023005 is 500320891.

It can be written as a sum of positive squares in 4 ways, for example, as 8988004 + 189035001 = 2998^2 + 13749^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 198023005 - 2¹ = 198023003 is a prime.

It is a super-2 number, since 2×198023005² = 78426221018460050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198023003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72270 + ... + 74959.

It is an arithmetic number, because the mean of its divisors is an integer number (29814075).

Almost surely, 2^198023005 is an apocalyptic number.

It is an amenable number.

198023005 is a deficient number, since it is larger than the sum of its proper divisors (40489595).

198023005 is a wasteful number, since it uses less digits than its factorization.

198023005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147503.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 198023005 is about 14072.0647028075. The cubic root of 198023005 is about 582.8702405328.

Adding to 198023005 its reverse (500320891), we get a palindrome (698343896).

The spelling of 198023005 in words is "one hundred ninety-eight million, twenty-three thousand, five".