198905642 has 32 divisors (see below), whose sum is σ = 340804800. Its totient is φ = 86306688.

The previous prime is 198905621. The next prime is 198905711. The reversal of 198905642 is 246509891.

It is a junction number, because it is equal to n+sod(n) for n = 198905593 and 198905602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66209 + ... + 69147.

It is an arithmetic number, because the mean of its divisors is an integer number (10650150).

Almost surely, 2^198905642 is an apocalyptic number.

198905642 is a deficient number, since it is larger than the sum of its proper divisors (141899158).

198905642 is a wasteful number, since it uses less digits than its factorization.

198905642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110.

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

The square root of 198905642 is about 14103.3911524853. The cubic root of 198905642 is about 583.7349554942.

The spelling of 198905642 in words is "one hundred ninety-eight million, nine hundred five thousand, six hundred forty-two".