1223809 has 8 divisors (see below), whose sum is σ = 1320480. Its totient is φ = 1130400.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223809 is 9083221.

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

It is a cyclic number.

It is not a de Polignac number, because 1223809 - 2⁵ = 1223777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (165060).

2^1223809 is an apocalyptic number.

1223809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1223809 is a deficient number, since it is larger than the sum of its proper divisors (96671).

1223809 is a wasteful number, since it uses less digits than its factorization.

1223809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1223809 is about 1106.2590112627. The cubic root of 1223809 is about 106.9640604835.

The spelling of 1223809 in words is "one million, two hundred twenty-three thousand, eight hundred nine".