123799691 has 4 divisors (see below), whose sum is σ = 124422000. Its totient is φ = 123177384.

The previous prime is 123799667. The next prime is 123799699. The reversal of 123799691 is 196997321.

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 123799691 - 2¹⁰ = 123798667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123799699) 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 3 ways as a sum of consecutive naturals, for example, 310856 + ... + 311253.

It is an arithmetic number, because the mean of its divisors is an integer number (31105500).

Almost surely, 2^123799691 is an apocalyptic number.

123799691 is a deficient number, since it is larger than the sum of its proper divisors (622309).

123799691 is an equidigital number, since it uses as much as digits as its factorization.

123799691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622308.

The product of its digits is 183708, while the sum is 47.

The square root of 123799691 is about 11126.5309508400. The cubic root of 123799691 is about 498.3944378589.

The spelling of 123799691 in words is "one hundred twenty-three million, seven hundred ninety-nine thousand, six hundred ninety-one".