2198191278 has 8 divisors (see below), whose sum is σ = 4396382568. Its totient is φ = 732730424.

The previous prime is 2198191277. The next prime is 2198191279. The reversal of 2198191278 is 8721918912.

It is an interprime number because it is at equal distance from previous prime (2198191277) and next prime (2198191279).

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

2198191278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198191277) 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, 183182601 + ... + 183182612.

It is an arithmetic number, because the mean of its divisors is an integer number (549547821).

Almost surely, 2^2198191278 is an apocalyptic number.

2198191278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2198191278 is a wasteful number, since it uses less digits than its factorization.

2198191278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366365218.

The product of its digits is 145152, while the sum is 48.

The square root of 2198191278 is about 46884.8725923405. The cubic root of 2198191278 is about 1300.2349236192.

The spelling of 2198191278 in words is "two billion, one hundred ninety-eight million, one hundred ninety-one thousand, two hundred seventy-eight".