846444821 has 4 divisors (see below), whose sum is σ = 862415532. Its totient is φ = 830474112.

The previous prime is 846444817. The next prime is 846444847. The reversal of 846444821 is 128444648.

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

It can be written as a sum of positive squares in 2 ways, for example, as 284091025 + 562353796 = 16855^2 + 23714^2 .

It is a cyclic number.

It is not a de Polignac number, because 846444821 - 2² = 846444817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (846444881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7985276 + ... + 7985381.

It is an arithmetic number, because the mean of its divisors is an integer number (215603883).

Almost surely, 2^846444821 is an apocalyptic number.

It is an amenable number.

846444821 is a deficient number, since it is larger than the sum of its proper divisors (15970711).

846444821 is a wasteful number, since it uses less digits than its factorization.

846444821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970710.

The product of its digits is 196608, while the sum is 41.

The square root of 846444821 is about 29093.7247701287. The cubic root of 846444821 is about 945.9457217732.

The spelling of 846444821 in words is "eight hundred forty-six million, four hundred forty-four thousand, eight hundred twenty-one".