123971917 has 8 divisors (see below), whose sum is σ = 125762616. Its totient is φ = 122191872.

The previous prime is 123971899. The next prime is 123971923. The reversal of 123971917 is 719179321.

It can be written as a sum of positive squares in 4 ways, for example, as 60435076 + 63536841 = 7774^2 + 7971^2 .

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 123971917 - 2¹⁵ = 123939149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123971917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123971977) 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, 22443 + ... + 27415.

It is an arithmetic number, because the mean of its divisors is an integer number (15720327).

Almost surely, 2^123971917 is an apocalyptic number.

It is an amenable number.

123971917 is a deficient number, since it is larger than the sum of its proper divisors (1790699).

123971917 is an equidigital number, since it uses as much as digits as its factorization.

123971917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327.

The product of its digits is 23814, while the sum is 40.

The square root of 123971917 is about 11134.2676903333. The cubic root of 123971917 is about 498.6254473394.

The spelling of 123971917 in words is "one hundred twenty-three million, nine hundred seventy-one thousand, nine hundred seventeen".