198138705 has 8 divisors (see below), whose sum is σ = 317021952. Its totient is φ = 105673968.

The previous prime is 198138683. The next prime is 198138739. The reversal of 198138705 is 507831891.

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

It is not a de Polignac number, because 198138705 - 2¹¹ = 198136657 is a prime.

It is a super-3 number, since 3×198138705³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6604609 + ... + 6604638.

It is an arithmetic number, because the mean of its divisors is an integer number (39627744).

Almost surely, 2^198138705 is an apocalyptic number.

198138705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198138705 is a deficient number, since it is larger than the sum of its proper divisors (118883247).

198138705 is a wasteful number, since it uses less digits than its factorization.

198138705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13209255.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 198138705 is about 14076.1750841626. The cubic root of 198138705 is about 582.9837373745.

The spelling of 198138705 in words is "one hundred ninety-eight million, one hundred thirty-eight thousand, seven hundred five".