198137238 has 32 divisors (see below), whose sum is σ = 430036992. Its totient is φ = 60496800.

The previous prime is 198137231. The next prime is 198137239. The reversal of 198137238 is 832731891.

It is a super-3 number, since 3×198137238³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198137238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198137231) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 523 + ... + 19913.

It is an arithmetic number, because the mean of its divisors is an integer number (13438656).

Almost surely, 2^198137238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198137238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215018496).

198137238 is an abundant number, since it is smaller than the sum of its proper divisors (231899754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198137238 is a wasteful number, since it uses less digits than its factorization.

198137238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19540.

The product of its digits is 72576, while the sum is 42.

The square root of 198137238 is about 14076.1229747399. The cubic root of 198137238 is about 582.9822985857.

The spelling of 198137238 in words is "one hundred ninety-eight million, one hundred thirty-seven thousand, two hundred thirty-eight".