12197778 has 16 divisors (see below), whose sum is σ = 24809760. Its totient is φ = 3996896.

The previous prime is 12197749. The next prime is 12197821. The reversal of 12197778 is 87779121.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 7 ways as a sum of consecutive naturals, for example, 16875 + ... + 17582.

It is an arithmetic number, because the mean of its divisors is an integer number (1550610).

Almost surely, 2^12197778 is an apocalyptic number.

12197778 is an abundant number, since it is smaller than the sum of its proper divisors (12611982).

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

12197778 is a wasteful number, since it uses less digits than its factorization.

12197778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34521.

The product of its digits is 49392, while the sum is 42.

The square root of 12197778 is about 3492.5317464556. The cubic root of 12197778 is about 230.1937749471.

The spelling of 12197778 in words is "twelve million, one hundred ninety-seven thousand, seven hundred seventy-eight".