778923 has 16 divisors (see below), whose sum is σ = 1222560. Its totient is φ = 488448.

The previous prime is 778913. The next prime is 778927. The reversal of 778923 is 329877.

It is not a de Polignac number, because 778923 - 2⁴ = 778907 is a prime.

778923 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (778927) 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, 390 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (76410).

2⁷⁷⁸⁹²³ is an apocalyptic number.

778923 is a deficient number, since it is larger than the sum of its proper divisors (443637).

778923 is a wasteful number, since it uses less digits than its factorization.

778923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723 (or 1717 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 778923 is about 882.5661448299. The cubic root of 778923 is about 92.0092539526.

The spelling of 778923 in words is "seven hundred seventy-eight thousand, nine hundred twenty-three".