123943209 has 32 divisors (see below), whose sum is σ = 191165184. Its totient is φ = 70748160.

The previous prime is 123943207. The next prime is 123943217. The reversal of 123943209 is 902349321.

It is not a de Polignac number, because 123943209 - 2¹ = 123943207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123943209.

It is not an unprimeable number, because it can be changed into a prime (123943207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45757 + ... + 48389.

It is an arithmetic number, because the mean of its divisors is an integer number (5973912).

Almost surely, 2^123943209 is an apocalyptic number.

It is an amenable number.

123943209 is a deficient number, since it is larger than the sum of its proper divisors (67221975).

123943209 is a wasteful number, since it uses less digits than its factorization.

123943209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 123943209 is about 11132.9784424475. The cubic root of 123943209 is about 498.5869557069.

The spelling of 123943209 in words is "one hundred twenty-three million, nine hundred forty-three thousand, two hundred nine".