1229909 has 4 divisors (see below), whose sum is σ = 1236960. Its totient is φ = 1222860.

The previous prime is 1229903. The next prime is 1229911. The reversal of 1229909 is 9099221.

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: 9099221 = 1451 ⋅6271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1229909 is a prime.

It is a super-2 number, since 2×1229909² = 3025352296562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229903) 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, 3257 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (309240).

2^1229909 is an apocalyptic number.

It is an amenable number.

1229909 is a deficient number, since it is larger than the sum of its proper divisors (7051).

1229909 is an equidigital number, since it uses as much as digits as its factorization.

1229909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1229909 is about 1109.0126239137. The cubic root of 1229909 is about 107.1414845962.

The spelling of 1229909 in words is "one million, two hundred twenty-nine thousand, nine hundred nine".