12047778 has 40 divisors (see below), whose sum is σ = 27878400. Its totient is φ = 3884760.

The previous prime is 12047771. The next prime is 12047803. The reversal of 12047778 is 87774021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12047771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3823 + ... + 6221.

It is an arithmetic number, because the mean of its divisors is an integer number (696960).

Almost surely, 2^12047778 is an apocalyptic number.

12047778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12047778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13939200).

12047778 is an abundant number, since it is smaller than the sum of its proper divisors (15830622).

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

12047778 is a wasteful number, since it uses less digits than its factorization.

12047778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 12047778 is about 3470.9909247937. The cubic root of 12047778 is about 229.2462914640.

The spelling of 12047778 in words is "twelve million, forty-seven thousand, seven hundred seventy-eight".