12205778 has 16 divisors (see below), whose sum is σ = 20575296. Its totient is φ = 5388240.

The previous prime is 12205777. The next prime is 12205789. The reversal of 12205778 is 87750221.

It is not an unprimeable number, because it can be changed into a prime (12205777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9608 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (1285956).

Almost surely, 2^12205778 is an apocalyptic number.

12205778 is a deficient number, since it is larger than the sum of its proper divisors (8369518).

12205778 is a wasteful number, since it uses less digits than its factorization.

12205778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20449.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 12205778 is about 3493.6768596995. The cubic root of 12205778 is about 230.2440886941.

Adding to 12205778 its reverse (87750221), we get a palindrome (99955999).

The spelling of 12205778 in words is "twelve million, two hundred five thousand, seven hundred seventy-eight".