123720775 has 6 divisors (see below), whose sum is σ = 153413792. Its totient is φ = 98976600.

The previous prime is 123720731. The next prime is 123720797. The reversal of 123720775 is 577027321.

It is a happy number.

It is not a de Polignac number, because 123720775 - 2⁹ = 123720263 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 123720775.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2474391 + ... + 2474440.

Almost surely, 2^123720775 is an apocalyptic number.

123720775 is a deficient number, since it is larger than the sum of its proper divisors (29693017).

123720775 is an equidigital number, since it uses as much as digits as its factorization.

123720775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948841 (or 4948836 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 123720775 is about 11122.9840870155. The cubic root of 123720775 is about 498.2885149891.

The spelling of 123720775 in words is "one hundred twenty-three million, seven hundred twenty thousand, seven hundred seventy-five".