198771438 has 8 divisors (see below), whose sum is σ = 397542888. Its totient is φ = 66257144.

The previous prime is 198771431. The next prime is 198771449. The reversal of 198771438 is 834177891.

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

198771438 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198771431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16564281 + ... + 16564292.

It is an arithmetic number, because the mean of its divisors is an integer number (49692861).

Almost surely, 2^198771438 is an apocalyptic number.

198771438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

198771438 is a wasteful number, since it uses less digits than its factorization.

198771438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33128578.

The product of its digits is 338688, while the sum is 48.

The square root of 198771438 is about 14098.6324868762. The cubic root of 198771438 is about 583.6036416534.

The spelling of 198771438 in words is "one hundred ninety-eight million, seven hundred seventy-one thousand, four hundred thirty-eight".