123857287 has 2 divisors, whose sum is σ = 123857288. Its totient is φ = 123857286.

The previous prime is 123857281. The next prime is 123857311. The reversal of 123857287 is 782758321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123857287 - 2⁷ = 123857159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123857281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61928643 + 61928644.

It is an arithmetic number, because the mean of its divisors is an integer number (61928644).

Almost surely, 2^123857287 is an apocalyptic number.

123857287 is a deficient number, since it is larger than the sum of its proper divisors (1).

123857287 is an equidigital number, since it uses as much as digits as its factorization.

123857287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 123857287 is about 11129.1188779705. The cubic root of 123857287 is about 498.4717161228.

The spelling of 123857287 in words is "one hundred twenty-three million, eight hundred fifty-seven thousand, two hundred eighty-seven".