123986857 has 2 divisors, whose sum is σ = 123986858. Its totient is φ = 123986856.

The previous prime is 123986843. The next prime is 123986873. The reversal of 123986857 is 758689321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94945536 + 29041321 = 9744^2 + 5389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123986857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123986857.

It is not a weakly prime, because it can be changed into another prime (123986827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61993428 + 61993429.

It is an arithmetic number, because the mean of its divisors is an integer number (61993429).

Almost surely, 2^123986857 is an apocalyptic number.

It is an amenable number.

123986857 is a deficient number, since it is larger than the sum of its proper divisors (1).

123986857 is an equidigital number, since it uses as much as digits as its factorization.

123986857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 123986857 is about 11134.9385719006. The cubic root of 123986857 is about 498.6454765125.

The spelling of 123986857 in words is "one hundred twenty-three million, nine hundred eighty-six thousand, eight hundred fifty-seven".