198153638 has 8 divisors (see below), whose sum is σ = 297524640. Its totient is φ = 98978760.

The previous prime is 198153629. The next prime is 198153667. The reversal of 198153638 is 836351891.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 46478 + ... + 50561.

It is an arithmetic number, because the mean of its divisors is an integer number (37190580).

Almost surely, 2^198153638 is an apocalyptic number.

198153638 is a deficient number, since it is larger than the sum of its proper divisors (99371002).

198153638 is a wasteful number, since it uses less digits than its factorization.

198153638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98062.

The product of its digits is 155520, while the sum is 44.

The square root of 198153638 is about 14076.7055094578. The cubic root of 198153638 is about 582.9983828009.

The spelling of 198153638 in words is "one hundred ninety-eight million, one hundred fifty-three thousand, six hundred thirty-eight".