12207978 has 12 divisors (see below), whose sum is σ = 26450658. Its totient is φ = 4069320.

The previous prime is 12207977. The next prime is 12208019. The reversal of 12207978 is 87970221.

It can be written as a sum of positive squares in only one way, i.e., 7935489 + 4272489 = 2817^2 + 2067^2 .

It is not an unprimeable number, because it can be changed into a prime (12207973) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 339093 + ... + 339128.

Almost surely, 2^12207978 is an apocalyptic number.

12207978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12207978 is an abundant number, since it is smaller than the sum of its proper divisors (14242680).

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

12207978 is a wasteful number, since it uses less digits than its factorization.

12207978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678229 (or 678226 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 12207978 is about 3493.9917000474. The cubic root of 12207978 is about 230.2579211201.

The spelling of 12207978 in words is "twelve million, two hundred seven thousand, nine hundred seventy-eight".