123243985 has 4 divisors (see below), whose sum is σ = 147892788. Its totient is φ = 98595184.

The previous prime is 123243947. The next prime is 123244007. The reversal of 123243985 is 589342321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70492816 + 52751169 = 8396^2 + 7263^2 .

It is a cyclic number.

It is not a de Polignac number, because 123243985 - 2⁹ = 123243473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12324394 + ... + 12324403.

It is an arithmetic number, because the mean of its divisors is an integer number (36973197).

Almost surely, 2^123243985 is an apocalyptic number.

It is an amenable number.

123243985 is a deficient number, since it is larger than the sum of its proper divisors (24648803).

123243985 is an equidigital number, since it uses as much as digits as its factorization.

123243985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24648802.

The product of its digits is 51840, while the sum is 37.

The square root of 123243985 is about 11101.5307503065. The cubic root of 123243985 is about 497.6475964184.

The spelling of 123243985 in words is "one hundred twenty-three million, two hundred forty-three thousand, nine hundred eighty-five".