855821448 has 24 divisors (see below), whose sum is σ = 2317849950. Its totient is φ = 285273792.

The previous prime is 855821443. The next prime is 855821453. The reversal of 855821448 is 844128558.

It is an interprime number because it is at equal distance from previous prime (855821443) and next prime (855821453).

It can be written as a sum of positive squares in only one way, i.e., 774063684 + 81757764 = 27822^2 + 9042^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (855821441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5943133 + ... + 5943276.

Almost surely, 2^855821448 is an apocalyptic number.

It is an amenable number.

855821448 is an abundant number, since it is smaller than the sum of its proper divisors (1462028502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855821448 is a wasteful number, since it uses less digits than its factorization.

855821448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886421 (or 11886414 counting only the distinct ones).

The product of its digits is 409600, while the sum is 45.

The square root of 855821448 is about 29254.4261266565. The cubic root of 855821448 is about 949.4258573281.

The spelling of 855821448 in words is "eight hundred fifty-five million, eight hundred twenty-one thousand, four hundred forty-eight".