12971778 has 8 divisors (see below), whose sum is σ = 25943568. Its totient is φ = 4323924.

The previous prime is 12971743. The next prime is 12971797. The reversal of 12971778 is 87717921.

12971778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

12971778 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080976 + ... + 1080987.

It is an arithmetic number, because the mean of its divisors is an integer number (3242946).

Almost surely, 2^12971778 is an apocalyptic number.

12971778 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.

12971778 is a wasteful number, since it uses less digits than its factorization.

12971778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161968.

The product of its digits is 49392, while the sum is 42.

The square root of 12971778 is about 3601.6354618423. The cubic root of 12971778 is about 234.9631932697.

It can be divided in two parts, 129717 and 78, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 12971778 in words is "twelve million, nine hundred seventy-one thousand, seven hundred seventy-eight".