1230809 has 4 divisors (see below), whose sum is σ = 1234704. Its totient is φ = 1226916.

The previous prime is 1230791. The next prime is 1230829. The reversal of 1230809 is 9080321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9080321 = 197 ⋅46093.

It is a cyclic number.

It is not a de Polignac number, because 1230809 - 2¹² = 1226713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230829) 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, 1427 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (308676).

2^1230809 is an apocalyptic number.

It is an amenable number.

1230809 is a deficient number, since it is larger than the sum of its proper divisors (3895).

1230809 is an equidigital number, since it uses as much as digits as its factorization.

1230809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1230809 is about 1109.4183160558. The cubic root of 1230809 is about 107.1676122271.

The spelling of 1230809 in words is "one million, two hundred thirty thousand, eight hundred nine".