12989778 has 8 divisors (see below), whose sum is σ = 25979568. Its totient is φ = 4329924.

The previous prime is 12989777. The next prime is 12989783. The reversal of 12989778 is 87798921.

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

12989778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 12989778.

It is not an unprimeable number, because it can be changed into a prime (12989773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082476 + ... + 1082487.

It is an arithmetic number, because the mean of its divisors is an integer number (3247446).

Almost surely, 2^12989778 is an apocalyptic number.

12989778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12989778 is a wasteful number, since it uses less digits than its factorization.

12989778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164968.

The product of its digits is 508032, while the sum is 51.

The square root of 12989778 is about 3604.1334603480. The cubic root of 12989778 is about 235.0718235268.

The spelling of 12989778 in words is "twelve million, nine hundred eighty-nine thousand, seven hundred seventy-eight".