123456287 has 2 divisors, whose sum is σ = 123456288. Its totient is φ = 123456286.

The previous prime is 123456247. The next prime is 123456293. The reversal of 123456287 is 782654321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123456287 - 2¹⁰ = 123455263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123456287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123456247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61728143 + 61728144.

It is an arithmetic number, because the mean of its divisors is an integer number (61728144).

Almost surely, 2^123456287 is an apocalyptic number.

123456287 is a deficient number, since it is larger than the sum of its proper divisors (1).

123456287 is an equidigital number, since it uses as much as digits as its factorization.

123456287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 123456287 is about 11111.0884705325. The cubic root of 123456287 is about 497.9331843177.

The spelling of 123456287 in words is "one hundred twenty-three million, four hundred fifty-six thousand, two hundred eighty-seven".