778947 has 8 divisors (see below), whose sum is σ = 1118544. Its totient is φ = 479328.

The previous prime is 778933. The next prime is 778951. The reversal of 778947 is 749877.

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

It is not a de Polignac number, because 778947 - 2⁷ = 778819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778899 and 778908.

It is not an unprimeable number, because it can be changed into a prime (778907) 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 7 ways as a sum of consecutive naturals, for example, 9948 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (139818).

2⁷⁷⁸⁹⁴⁷ is an apocalyptic number.

778947 is a deficient number, since it is larger than the sum of its proper divisors (339597).

778947 is a wasteful number, since it uses less digits than its factorization.

778947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19989.

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

The square root of 778947 is about 882.5797414398. The cubic root of 778947 is about 92.0101989323.

The spelling of 778947 in words is "seven hundred seventy-eight thousand, nine hundred forty-seven".