391243198 has 4 divisors (see below), whose sum is σ = 586864800. Its totient is φ = 195621598.

The previous prime is 391243189. The next prime is 391243201. The reversal of 391243198 is 891342193.

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

It is a self number, because there is not a number n which added to its sum of digits gives 391243198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97810798 + ... + 97810801.

It is an arithmetic number, because the mean of its divisors is an integer number (146716200).

Almost surely, 2^391243198 is an apocalyptic number.

391243198 is a deficient number, since it is larger than the sum of its proper divisors (195621602).

391243198 is a wasteful number, since it uses less digits than its factorization.

391243198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195621601.

The product of its digits is 46656, while the sum is 40.

The square root of 391243198 is about 19779.8685031018. The cubic root of 391243198 is about 731.3898573121.

The spelling of 391243198 in words is "three hundred ninety-one million, two hundred forty-three thousand, one hundred ninety-eight".