123986791 has 4 divisors (see below), whose sum is σ = 124241872. Its totient is φ = 123731712.

The previous prime is 123986771. The next prime is 123986809. The reversal of 123986791 is 197689321.

It is a happy number.

123986791 is nontrivially palindromic in base 16.

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 123986791 - 2⁹ = 123986279 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 (123986771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126810 + ... + 127783.

It is an arithmetic number, because the mean of its divisors is an integer number (31060468).

Almost surely, 2^123986791 is an apocalyptic number.

123986791 is a deficient number, since it is larger than the sum of its proper divisors (255081).

123986791 is an equidigital number, since it uses as much as digits as its factorization.

123986791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255080.

The product of its digits is 163296, while the sum is 46.

The square root of 123986791 is about 11134.9356082557. The cubic root of 123986791 is about 498.6453880337.

The spelling of 123986791 in words is "one hundred twenty-three million, nine hundred eighty-six thousand, seven hundred ninety-one".