123040009 has 4 divisors (see below), whose sum is σ = 123677716. Its totient is φ = 122402304.

The previous prime is 123040003. The next prime is 123040037. The reversal of 123040009 is 900040321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85155984 + 37884025 = 9228^2 + 6155^2 .

It is a cyclic number.

It is not a de Polignac number, because 123040009 - 2¹³ = 123031817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123040003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318564 + ... + 318949.

It is an arithmetic number, because the mean of its divisors is an integer number (30919429).

Almost surely, 2^123040009 is an apocalyptic number.

It is an amenable number.

123040009 is a deficient number, since it is larger than the sum of its proper divisors (637707).

123040009 is an equidigital number, since it uses as much as digits as its factorization.

123040009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637706.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123040009 is about 11092.3401047750. The cubic root of 123040009 is about 497.3728995280.

The spelling of 123040009 in words is "one hundred twenty-three million, forty thousand, nine".