123720085 has 16 divisors (see below), whose sum is σ = 150148080. Its totient is φ = 97861120.

The previous prime is 123720053. The next prime is 123720131. The reversal of 123720085 is 580027321.

It can be written as a sum of positive squares in 8 ways, for example, as 21325924 + 102394161 = 4618^2 + 10119^2 .

It is not a de Polignac number, because 123720085 - 2⁵ = 123720053 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 242811 + ... + 243319.

It is an arithmetic number, because the mean of its divisors is an integer number (9384255).

Almost surely, 2^123720085 is an apocalyptic number.

It is an amenable number.

123720085 is a deficient number, since it is larger than the sum of its proper divisors (26427995).

123720085 is a wasteful number, since it uses less digits than its factorization.

123720085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 123720085 is about 11122.9530701159. The cubic root of 123720085 is about 498.2875886566.

The spelling of 123720085 in words is "one hundred twenty-three million, seven hundred twenty thousand, eighty-five".