198880642 has 4 divisors (see below), whose sum is σ = 298320966. Its totient is φ = 99440320.

The previous prime is 198880639. The next prime is 198880651. The reversal of 198880642 is 246088891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246088891 = 23 ⋅10699517.

It can be written as a sum of positive squares in only one way, i.e., 189090001 + 9790641 = 13751^2 + 3129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 198880592 and 198880601.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49720159 + ... + 49720162.

Almost surely, 2^198880642 is an apocalyptic number.

198880642 is a deficient number, since it is larger than the sum of its proper divisors (99440324).

198880642 is an equidigital number, since it uses as much as digits as its factorization.

198880642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99440323.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 198880642 is about 14102.5048129756. The cubic root of 198880642 is about 583.7104983610.

The spelling of 198880642 in words is "one hundred ninety-eight million, eight hundred eighty thousand, six hundred forty-two".