123438666 has 64 divisors (see below), whose sum is σ = 284110848. Its totient is φ = 35417088.

The previous prime is 123438661. The next prime is 123438673. The reversal of 123438666 is 666834321.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (123438661) 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, 168036 + ... + 168768.

It is an arithmetic number, because the mean of its divisors is an integer number (4439232).

Almost surely, 2^123438666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123438666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142055424).

123438666 is an abundant number, since it is smaller than the sum of its proper divisors (160672182).

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

123438666 is a wasteful number, since it uses less digits than its factorization.

123438666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895.

The product of its digits is 124416, while the sum is 39.

The square root of 123438666 is about 11110.2954956203. The cubic root of 123438666 is about 497.9094930762.

The spelling of 123438666 in words is "one hundred twenty-three million, four hundred thirty-eight thousand, six hundred sixty-six".