1073821909 has 4 divisors (see below), whose sum is σ = 1075615200. Its totient is φ = 1072028620.

The previous prime is 1073821901. The next prime is 1073821961. The reversal of 1073821909 is 9091283701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1073821909 - 2³ = 1073821901 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 (1073821901) 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, 895747 + ... + 896944.

It is an arithmetic number, because the mean of its divisors is an integer number (268903800).

Almost surely, 2^1073821909 is an apocalyptic number.

It is an amenable number.

1073821909 is a deficient number, since it is larger than the sum of its proper divisors (1793291).

1073821909 is an equidigital number, since it uses as much as digits as its factorization.

1073821909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793290.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1073821909 is about 32769.2219773372. The cubic root of 1073821909 is about 1024.0254577030.

The spelling of 1073821909 in words is "one billion, seventy-three million, eight hundred twenty-one thousand, nine hundred nine".