197816642 has 8 divisors (see below), whose sum is σ = 306296832. Its totient is φ = 95717700.

The previous prime is 197816621. The next prime is 197816683. The reversal of 197816642 is 246618791.

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 = 197816593 and 197816602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595234 + ... + 1595357.

It is an arithmetic number, because the mean of its divisors is an integer number (38287104).

Almost surely, 2^197816642 is an apocalyptic number.

197816642 is a deficient number, since it is larger than the sum of its proper divisors (108480190).

197816642 is a wasteful number, since it uses less digits than its factorization.

197816642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190624.

The product of its digits is 145152, while the sum is 44.

The square root of 197816642 is about 14064.7304275624. The cubic root of 197816642 is about 582.6676973004.

The spelling of 197816642 in words is "one hundred ninety-seven million, eight hundred sixteen thousand, six hundred forty-two".