123043985 has 4 divisors (see below), whose sum is σ = 147652788. Its totient is φ = 98435184.

The previous prime is 123043967. The next prime is 123044021. The reversal of 123043985 is 589340321.

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 27552001 + 95491984 = 5249^2 + 9772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123043985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 12304394 + ... + 12304403.

It is an arithmetic number, because the mean of its divisors is an integer number (36913197).

Almost surely, 2^123043985 is an apocalyptic number.

It is an amenable number.

123043985 is a deficient number, since it is larger than the sum of its proper divisors (24608803).

123043985 is an equidigital number, since it uses as much as digits as its factorization.

123043985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24608802.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 123043985 is about 11092.5193261044. The cubic root of 123043985 is about 497.3782569543.

The spelling of 123043985 in words is "one hundred twenty-three million, forty-three thousand, nine hundred eighty-five".