123109207 has 4 divisors (see below), whose sum is σ = 132579160. Its totient is φ = 113639256.

The previous prime is 123109193. The next prime is 123109211. The reversal of 123109207 is 702901321.

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

It is a cyclic number.

It is not a de Polignac number, because 123109207 - 2⁷ = 123109079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123109237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4734957 + ... + 4734982.

It is an arithmetic number, because the mean of its divisors is an integer number (33144790).

Almost surely, 2^123109207 is an apocalyptic number.

123109207 is a deficient number, since it is larger than the sum of its proper divisors (9469953).

123109207 is an equidigital number, since it uses as much as digits as its factorization.

123109207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9469952.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 123109207 is about 11095.4588458522. The cubic root of 123109207 is about 497.4661232961.

The spelling of 123109207 in words is "one hundred twenty-three million, one hundred nine thousand, two hundred seven".