123415409 has 8 divisors (see below), whose sum is σ = 133366632. Its totient is φ = 113529600.

The previous prime is 123415403. The next prime is 123415423. The reversal of 123415409 is 904514321.

It can be written as a sum of positive squares in 4 ways, for example, as 70896400 + 52519009 = 8420^2 + 7247^2 .

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 123415409 - 2⁸ = 123415153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123415403) 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, 12392 + ... + 20009.

It is an arithmetic number, because the mean of its divisors is an integer number (16670829).

Almost surely, 2^123415409 is an apocalyptic number.

It is an amenable number.

123415409 is a deficient number, since it is larger than the sum of its proper divisors (9951223).

123415409 is a wasteful number, since it uses less digits than its factorization.

123415409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32707.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 123415409 is about 11109.2488044872. The cubic root of 123415409 is about 497.8782208426.

The spelling of 123415409 in words is "one hundred twenty-three million, four hundred fifteen thousand, four hundred nine".