12420666 has 12 divisors (see below), whose sum is σ = 26911482. Its totient is φ = 4140216.

The previous prime is 12420649. The next prime is 12420673. The reversal of 12420666 is 66602421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9126441 + 3294225 = 3021^2 + 1815^2 .

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 5 ways as a sum of consecutive naturals, for example, 345001 + ... + 345036.

Almost surely, 2^12420666 is an apocalyptic number.

12420666 is an abundant number, since it is smaller than the sum of its proper divisors (14490816).

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

12420666 is a wasteful number, since it uses less digits than its factorization.

12420666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690045 (or 690042 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 12420666 is about 3524.2965255495. The cubic root of 12420666 is about 231.5874182181.

The spelling of 12420666 in words is "twelve million, four hundred twenty thousand, six hundred sixty-six".