198055642 has 4 divisors (see below), whose sum is σ = 297083466. Its totient is φ = 99027820.

The previous prime is 198055619. The next prime is 198055651. The reversal of 198055642 is 246550891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 180069561 + 17986081 = 13419^2 + 4241^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 198055595 and 198055604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49513909 + ... + 49513912.

Almost surely, 2^198055642 is an apocalyptic number.

198055642 is a deficient number, since it is larger than the sum of its proper divisors (99027824).

198055642 is an equidigital number, since it uses as much as digits as its factorization.

198055642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99027823.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 198055642 is about 14073.2242929614. The cubic root of 198055642 is about 582.9022605348.

The spelling of 198055642 in words is "one hundred ninety-eight million, fifty-five thousand, six hundred forty-two".