122857823 has 4 divisors (see below), whose sum is σ = 134026728. Its totient is φ = 111688920.

The previous prime is 122857811. The next prime is 122857829. The reversal of 122857823 is 328758221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328758221 = 11 ⋅29887111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122857823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122857829) 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, 5584436 + ... + 5584457.

It is an arithmetic number, because the mean of its divisors is an integer number (33506682).

Almost surely, 2^122857823 is an apocalyptic number.

122857823 is a deficient number, since it is larger than the sum of its proper divisors (11168905).

122857823 is a wasteful number, since it uses less digits than its factorization.

122857823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11168904.

The product of its digits is 53760, while the sum is 38.

The square root of 122857823 is about 11084.1248188569. The cubic root of 122857823 is about 497.1272906917.

The spelling of 122857823 in words is "one hundred twenty-two million, eight hundred fifty-seven thousand, eight hundred twenty-three".