123609855 has 16 divisors (see below), whose sum is σ = 198167904. Its totient is φ = 65794560.

The previous prime is 123609823. The next prime is 123609869. The reversal of 123609855 is 558906321.

It is not a de Polignac number, because 123609855 - 2⁵ = 123609823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (12385494).

Almost surely, 2^123609855 is an apocalyptic number.

123609855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123609855 is a deficient number, since it is larger than the sum of its proper divisors (74558049).

123609855 is a wasteful number, since it uses less digits than its factorization.

123609855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16346.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 123609855 is about 11117.9968969235. The cubic root of 123609855 is about 498.1395594411.

The spelling of 123609855 in words is "one hundred twenty-three million, six hundred nine thousand, eight hundred fifty-five".