1073906821 has 8 divisors (see below), whose sum is σ = 1158232824. Its totient is φ = 989826240.

The previous prime is 1073906819. The next prime is 1073906831. The reversal of 1073906821 is 1286093701.

It can be written as a sum of positive squares in 4 ways, for example, as 216237025 + 857669796 = 14705^2 + 29286^2 .

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

It is not a de Polignac number, because 1073906821 - 2¹ = 1073906819 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 (1073906831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52210 + ... + 69811.

It is an arithmetic number, because the mean of its divisors is an integer number (144779103).

Almost surely, 2^1073906821 is an apocalyptic number.

It is an amenable number.

1073906821 is a deficient number, since it is larger than the sum of its proper divisors (84326003).

1073906821 is a wasteful number, since it uses less digits than its factorization.

1073906821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122711.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1073906821 is about 32770.5175577073. The cubic root of 1073906821 is about 1024.0524484473.

The spelling of 1073906821 in words is "one billion, seventy-three million, nine hundred six thousand, eight hundred twenty-one".