123863857 has 4 divisors (see below), whose sum is σ = 133391860. Its totient is φ = 114335856.

The previous prime is 123863851. The next prime is 123863867. The reversal of 123863857 is 758368321.

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 19088161 + 104775696 = 4369^2 + 10236^2 .

It is a cyclic number.

It is not a de Polignac number, because 123863857 - 2¹⁵ = 123831089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123863851) by changing a digit.

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, 4763982 + ... + 4764007.

It is an arithmetic number, because the mean of its divisors is an integer number (33347965).

Almost surely, 2^123863857 is an apocalyptic number.

It is an amenable number.

123863857 is a deficient number, since it is larger than the sum of its proper divisors (9528003).

123863857 is an equidigital number, since it uses as much as digits as its factorization.

123863857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528002.

The product of its digits is 241920, while the sum is 43.

The square root of 123863857 is about 11129.4140456719. The cubic root of 123863857 is about 498.4805297646.

The spelling of 123863857 in words is "one hundred twenty-three million, eight hundred sixty-three thousand, eight hundred fifty-seven".