1123729409 has 8 divisors (see below), whose sum is σ = 1231150752. Its totient is φ = 1017185440.

The previous prime is 1123729403. The next prime is 1123729433. The reversal of 1123729409 is 9049273211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123729409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1123729403) 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 7 ways as a sum of consecutive naturals, for example, 216659 + ... + 221784.

It is an arithmetic number, because the mean of its divisors is an integer number (153893844).

Almost surely, 2^1123729409 is an apocalyptic number.

It is an amenable number.

1123729409 is a deficient number, since it is larger than the sum of its proper divisors (107421343).

1123729409 is a wasteful number, since it uses less digits than its factorization.

1123729409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438687.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1123729409 is about 33522.0734591403. The cubic root of 1123729409 is about 1039.6502179853.

The spelling of 1123729409 in words is "one billion, one hundred twenty-three million, seven hundred twenty-nine thousand, four hundred nine".