947778 has 32 divisors (see below), whose sum is σ = 2116800. Its totient is φ = 280896.

The previous prime is 947773. The next prime is 947783. The reversal of 947778 is 877749.

947778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (947773) and next prime (947783).

It is a d-powerful number, because it can be written as 9² + 4⁶ + 7⁴ + 7⁶ + 7⁷ + 8 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (947773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2053 + ... + 2471.

It is an arithmetic number, because the mean of its divisors is an integer number (66150).

2⁹⁴⁷⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 947778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058400).

947778 is an abundant number, since it is smaller than the sum of its proper divisors (1169022).

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

947778 is a wasteful number, since it uses less digits than its factorization.

947778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466.

The product of its digits is 98784, while the sum is 42.

The square root of 947778 is about 973.5389052318. The cubic root of 947778 is about 98.2280541988.

The spelling of 947778 in words is "nine hundred forty-seven thousand, seven hundred seventy-eight".