123012785 has 12 divisors (see below), whose sum is σ = 171716148. Its totient is φ = 84351456.

The previous prime is 123012733. The next prime is 123012787. The reversal of 123012785 is 587210321.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 100620961 = 4732^2 + 10031^2 .

It is not a de Polignac number, because 123012785 - 2¹⁰ = 123011761 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123012787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250802 + ... + 251291.

It is an arithmetic number, because the mean of its divisors is an integer number (14309679).

Almost surely, 2^123012785 is an apocalyptic number.

It is an amenable number.

123012785 is a deficient number, since it is larger than the sum of its proper divisors (48703363).

123012785 is an equidigital number, since it uses as much as digits as its factorization.

123012785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502112 (or 502105 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 123012785 is about 11091.1128837462. The cubic root of 123012785 is about 497.3362136871.

The spelling of 123012785 in words is "one hundred twenty-three million, twelve thousand, seven hundred eighty-five".