12820178 has 8 divisors (see below), whose sum is σ = 21977472. Its totient is φ = 5494356.

The previous prime is 12820151. The next prime is 12820201. The reversal of 12820178 is 87102821.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12820178.

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 3 ways as a sum of consecutive naturals, for example, 457850 + ... + 457877.

It is an arithmetic number, because the mean of its divisors is an integer number (2747184).

Almost surely, 2^12820178 is an apocalyptic number.

12820178 is a deficient number, since it is larger than the sum of its proper divisors (9157294).

12820178 is an equidigital number, since it uses as much as digits as its factorization.

12820178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915736.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12820178 is about 3580.5276147518. The cubic root of 12820178 is about 234.0442729194.

Adding to 12820178 its reverse (87102821), we get a palindrome (99922999).

The spelling of 12820178 in words is "twelve million, eight hundred twenty thousand, one hundred seventy-eight".