123655287 has 32 divisors (see below), whose sum is σ = 199065600. Its totient is φ = 66698208.

The previous prime is 123655283. The next prime is 123655289. The reversal of 123655287 is 782556321.

It is not a de Polignac number, because 123655287 - 2² = 123655283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123655283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190798 + ... + 191444.

It is an arithmetic number, because the mean of its divisors is an integer number (6220800).

Almost surely, 2^123655287 is an apocalyptic number.

123655287 is a deficient number, since it is larger than the sum of its proper divisors (75410313).

123655287 is a wasteful number, since it uses less digits than its factorization.

123655287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155.

The product of its digits is 100800, while the sum is 39.

The square root of 123655287 is about 11120.0398830220. The cubic root of 123655287 is about 498.2005812864.

The spelling of 123655287 in words is "one hundred twenty-three million, six hundred fifty-five thousand, two hundred eighty-seven".