1827084779809 has 3 divisors (see below), whose sum is σ = 1827086131507. Its totient is φ = 1827083428112.

The previous prime is 1827084779749. The next prime is 1827084779833. The reversal of 1827084779809 is 9089774807281.

The square root of 1827084779809 is 1351697.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1684557389025 + 142527390784 = 1297905^2 + 377528^2 .

It is not a de Polignac number, because 1827084779809 - 2¹¹ = 1827084777761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1827084779309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 675849 + ... + 2027545.

Almost surely, 2^{1827084779809} is an apocalyptic number.

1827084779809 is the 1351697-th square number.

1827084779809 is the 675849-th centered octagonal number.

It is an amenable number.

1827084779809 is a deficient number, since it is larger than the sum of its proper divisors (1351698).

1827084779809 is an frugal number, since it uses more digits than its factorization.

1827084779809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703394 (or 1351697 counting only the distinct ones).

The product of its (nonzero) digits is 113799168, while the sum is 70.

The spelling of 1827084779809 in words is "one trillion, eight hundred twenty-seven billion, eighty-four million, seven hundred seventy-nine thousand, eight hundred nine".