123578857 has 2 divisors, whose sum is σ = 123578858. Its totient is φ = 123578856.

The previous prime is 123578789. The next prime is 123578921. The reversal of 123578857 is 758875321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70157376 + 53421481 = 8376^2 + 7309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123578857 is a prime.

It is not a weakly prime, because it can be changed into another prime (123570857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61789428 + 61789429.

It is an arithmetic number, because the mean of its divisors is an integer number (61789429).

Almost surely, 2^123578857 is an apocalyptic number.

It is an amenable number.

123578857 is a deficient number, since it is larger than the sum of its proper divisors (1).

123578857 is an equidigital number, since it uses as much as digits as its factorization.

123578857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 46.

The square root of 123578857 is about 11116.6027634345. The cubic root of 123578857 is about 498.0979159950.

The spelling of 123578857 in words is "one hundred twenty-three million, five hundred seventy-eight thousand, eight hundred fifty-seven".