821273849 has 8 divisors (see below), whose sum is σ = 912840192. Its totient is φ = 732525040.

The previous prime is 821273839. The next prime is 821273861. The reversal of 821273849 is 948372128.

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

It is a cyclic number.

It is not a de Polignac number, because 821273849 - 2¹² = 821269753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821273819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703769 + ... + 704934.

It is an arithmetic number, because the mean of its divisors is an integer number (114105024).

Almost surely, 2^821273849 is an apocalyptic number.

It is an amenable number.

821273849 is a deficient number, since it is larger than the sum of its proper divisors (91566343).

821273849 is a wasteful number, since it uses less digits than its factorization.

821273849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408767.

The product of its digits is 193536, while the sum is 44.

The square root of 821273849 is about 28657.8758633643. The cubic root of 821273849 is about 936.4745904673.

The spelling of 821273849 in words is "eight hundred twenty-one million, two hundred seventy-three thousand, eight hundred forty-nine".