123638660 has 12 divisors (see below), whose sum is σ = 259641228. Its totient is φ = 49455456.

The previous prime is 123638653. The next prime is 123638677. The reversal of 123638660 is 66836321.

It can be written as a sum of positive squares in 2 ways, for example, as 92813956 + 30824704 = 9634^2 + 5552^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123638660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090947 + ... + 3090986.

It is an arithmetic number, because the mean of its divisors is an integer number (21636769).

Almost surely, 2^123638660 is an apocalyptic number.

123638660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123638660 is an abundant number, since it is smaller than the sum of its proper divisors (136002568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123638660 is a wasteful number, since it uses less digits than its factorization.

123638660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6181942 (or 6181940 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 123638660 is about 11119.2922436637. The cubic root of 123638660 is about 498.1782505189.

The spelling of 123638660 in words is "one hundred twenty-three million, six hundred thirty-eight thousand, six hundred sixty".