849239866 has 4 divisors (see below), whose sum is σ = 1273859802. Its totient is φ = 424619932.

The previous prime is 849239849. The next prime is 849239891. The reversal of 849239866 is 668932948.

It is a happy number.

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., 695851641 + 153388225 = 26379^2 + 12385^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212309965 + ... + 212309968.

Almost surely, 2^849239866 is an apocalyptic number.

849239866 is a deficient number, since it is larger than the sum of its proper divisors (424619936).

849239866 is a wasteful number, since it uses less digits than its factorization.

849239866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424619935.

The product of its digits is 4478976, while the sum is 55.

The square root of 849239866 is about 29141.7203678849. The cubic root of 849239866 is about 946.9857801106.

The spelling of 849239866 in words is "eight hundred forty-nine million, two hundred thirty-nine thousand, eight hundred sixty-six".