849778 has 4 divisors (see below), whose sum is σ = 1274670. Its totient is φ = 424888.

The previous prime is 849773. The next prime is 849829. The reversal of 849778 is 877948.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 710649 + 139129 = 843^2 + 373^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (849773) by changing a digit.

849778 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212443 + ... + 212446.

2⁸⁴⁹⁷⁷⁸ is an apocalyptic number.

849778 is a deficient number, since it is larger than the sum of its proper divisors (424892).

849778 is a wasteful number, since it uses less digits than its factorization.

849778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424891.

The product of its digits is 112896, while the sum is 43.

The square root of 849778 is about 921.8340414630. The cubic root of 849778 is about 94.7185761947.

The spelling of 849778 in words is "eight hundred forty-nine thousand, seven hundred seventy-eight".