123456687 has 4 divisors (see below), whose sum is σ = 164608920. Its totient is φ = 82304456.

The previous prime is 123456677. The next prime is 123456691. The reversal of 123456687 is 786654321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123456687 - 2⁷ = 123456559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123456637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20576112 + ... + 20576117.

It is an arithmetic number, because the mean of its divisors is an integer number (41152230).

Almost surely, 2^123456687 is an apocalyptic number.

123456687 is a deficient number, since it is larger than the sum of its proper divisors (41152233).

123456687 is an equidigital number, since it uses as much as digits as its factorization.

123456687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41152232.

The product of its digits is 241920, while the sum is 42.

The square root of 123456687 is about 11111.1064705546. The cubic root of 123456687 is about 497.9337220872.

The spelling of 123456687 in words is "one hundred twenty-three million, four hundred fifty-six thousand, six hundred eighty-seven".