123040409 has 8 divisors (see below), whose sum is σ = 135147840. Its totient is φ = 111496176.

The previous prime is 123040403. The next prime is 123040427. The reversal of 123040409 is 904040321.

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-123040409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123040403) 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, 140342 + ... + 141215.

It is an arithmetic number, because the mean of its divisors is an integer number (16893480).

Almost surely, 2^123040409 is an apocalyptic number.

123040409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

123040409 is a deficient number, since it is larger than the sum of its proper divisors (12107431).

123040409 is a wasteful number, since it uses less digits than its factorization.

123040409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281599.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 123040409 is about 11092.3581352208. The cubic root of 123040409 is about 497.3734385097.

The spelling of 123040409 in words is "one hundred twenty-three million, forty thousand, four hundred nine".