198040642 has 8 divisors (see below), whose sum is σ = 298616832. Its totient is φ = 98501700.

The previous prime is 198040637. The next prime is 198040643. The reversal of 198040642 is 246040891.

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

It is a junction number, because it is equal to n+sod(n) for n = 198040598 and 198040607.

It is not an unprimeable number, because it can be changed into a prime (198040643) 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, 258834 + ... + 259597.

It is an arithmetic number, because the mean of its divisors is an integer number (37327104).

Almost surely, 2^198040642 is an apocalyptic number.

198040642 is a deficient number, since it is larger than the sum of its proper divisors (100576190).

198040642 is a wasteful number, since it uses less digits than its factorization.

198040642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518624.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 198040642 is about 14072.6913559560. The cubic root of 198040642 is about 582.8875445446.

The spelling of 198040642 in words is "one hundred ninety-eight million, forty thousand, six hundred forty-two".