1230309 has 24 divisors (see below), whose sum is σ = 1895712. Its totient is φ = 797040.

The previous prime is 1230301. The next prime is 1230311. The reversal of 1230309 is 9030321.

It is not a de Polignac number, because 1230309 - 2³ = 1230301 is a prime.

It is an alternating number because its digits alternate between odd and even.

1230309 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1230291 and 1230300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14782 + ... + 14864.

It is an arithmetic number, because the mean of its divisors is an integer number (78988).

2^1230309 is an apocalyptic number.

It is an amenable number.

1230309 is a deficient number, since it is larger than the sum of its proper divisors (665403).

1230309 is an frugal number, since it uses more digits than its factorization.

1230309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1230309 is about 1109.1929498514. The cubic root of 1230309 is about 107.1530984496.

The spelling of 1230309 in words is "one million, two hundred thirty thousand, three hundred nine".