778238 has 8 divisors (see below), whose sum is σ = 1186680. Its totient is φ = 382680.

The previous prime is 778237. The next prime is 778241. The reversal of 778238 is 832877.

It is a happy number.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 778198 and 778207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3068 + ... + 3311.

It is an arithmetic number, because the mean of its divisors is an integer number (148335).

2⁷⁷⁸²³⁸ is an apocalyptic number.

778238 is a deficient number, since it is larger than the sum of its proper divisors (408442).

778238 is a wasteful number, since it uses less digits than its factorization.

778238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442.

The product of its digits is 18816, while the sum is 35.

The square root of 778238 is about 882.1779865764. The cubic root of 778238 is about 91.9822744679.

The spelling of 778238 in words is "seven hundred seventy-eight thousand, two hundred thirty-eight".