123142785 has 16 divisors (see below), whose sum is σ = 197557440. Its totient is φ = 65499840.

The previous prime is 123142753. The next prime is 123142801. The reversal of 123142785 is 587241321.

It is not a de Polignac number, because 123142785 - 2⁵ = 123142753 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 5146 + ... + 16515.

It is an arithmetic number, because the mean of its divisors is an integer number (12347340).

Almost surely, 2^123142785 is an apocalyptic number.

123142785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123142785 is a deficient number, since it is larger than the sum of its proper divisors (74414655).

123142785 is a wasteful number, since it uses less digits than its factorization.

123142785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22048.

The product of its digits is 13440, while the sum is 33.

The square root of 123142785 is about 11096.9718842574. The cubic root of 123142785 is about 497.5113470977.

The spelling of 123142785 in words is "one hundred twenty-three million, one hundred forty-two thousand, seven hundred eighty-five".