122985865 has 4 divisors (see below), whose sum is σ = 147583044. Its totient is φ = 98388688.

The previous prime is 122985847. The next prime is 122985869. The reversal of 122985865 is 568589221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568589221 = 47 ⋅12097643.

It can be written as a sum of positive squares in 2 ways, for example, as 57957769 + 65028096 = 7613^2 + 8064^2 .

It is a cyclic number.

It is not a de Polignac number, because 122985865 - 2⁹ = 122985353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122985869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12298582 + ... + 12298591.

It is an arithmetic number, because the mean of its divisors is an integer number (36895761).

Almost surely, 2^122985865 is an apocalyptic number.

It is an amenable number.

122985865 is a deficient number, since it is larger than the sum of its proper divisors (24597179).

122985865 is an equidigital number, since it uses as much as digits as its factorization.

122985865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24597178.

The product of its digits is 345600, while the sum is 46.

The square root of 122985865 is about 11089.8992330859. The cubic root of 122985865 is about 497.2999321802.

The spelling of 122985865 in words is "one hundred twenty-two million, nine hundred eighty-five thousand, eight hundred sixty-five".