778842 has 16 divisors (see below), whose sum is σ = 1730880. Its totient is φ = 259596.

The previous prime is 778831. The next prime is 778847. The reversal of 778842 is 248877.

It is a junction number, because it is equal to n+sod(n) for n = 778797 and 778806.

It is not an unprimeable number, because it can be changed into a prime (778847) 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, 7158 + ... + 7265.

It is an arithmetic number, because the mean of its divisors is an integer number (108180).

2⁷⁷⁸⁸⁴² is an apocalyptic number.

778842 is an abundant number, since it is smaller than the sum of its proper divisors (952038).

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

778842 is a wasteful number, since it uses less digits than its factorization.

778842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14434 (or 14428 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 778842 is about 882.5202547251. The cubic root of 778842 is about 92.0060645026.

The spelling of 778842 in words is "seven hundred seventy-eight thousand, eight hundred forty-two".