123387909 has 16 divisors (see below), whose sum is σ = 166872960. Its totient is φ = 81086720.

The previous prime is 123387899. The next prime is 123387931. The reversal of 123387909 is 909783321.

It is a cyclic number.

It is not a de Polignac number, because 123387909 - 2⁵ = 123387877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123385909) 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 15 ways as a sum of consecutive naturals, for example, 138664 + ... + 139550.

It is an arithmetic number, because the mean of its divisors is an integer number (10429560).

Almost surely, 2^123387909 is an apocalyptic number.

It is an amenable number.

123387909 is a deficient number, since it is larger than the sum of its proper divisors (43485051).

123387909 is an equidigital number, since it uses as much as digits as its factorization.

123387909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 123387909 is about 11108.0110280824. The cubic root of 123387909 is about 497.8412382425.

The spelling of 123387909 in words is "one hundred twenty-three million, three hundred eighty-seven thousand, nine hundred nine".