843856949 has 8 divisors (see below), whose sum is σ = 909266232. Its totient is φ = 778518720.

The previous prime is 843856903. The next prime is 843856969. The reversal of 843856949 is 949658348.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3900625 + 839956324 = 1975^2 + 28982^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-843856949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 843856894 and 843856903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843856969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8339 + ... + 41919.

It is an arithmetic number, because the mean of its divisors is an integer number (113658279).

Almost surely, 2^843856949 is an apocalyptic number.

It is an amenable number.

843856949 is a deficient number, since it is larger than the sum of its proper divisors (65409283).

843856949 is a wasteful number, since it uses less digits than its factorization.

843856949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35527.

The product of its digits is 7464960, while the sum is 56.

The square root of 843856949 is about 29049.2159790931. The cubic root of 843856949 is about 944.9807108592.

The spelling of 843856949 in words is "eight hundred forty-three million, eight hundred fifty-six thousand, nine hundred forty-nine".