123011620 has 48 divisors (see below), whose sum is σ = 269438400. Its totient is φ = 47116160.

The previous prime is 123011599. The next prime is 123011621. The reversal of 123011620 is 26110321.

It is a junction number, because it is equal to n+sod(n) for n = 123011594 and 123011603.

It is not an unprimeable number, because it can be changed into a prime (123011621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75171 + ... + 76789.

It is an arithmetic number, because the mean of its divisors is an integer number (5613300).

Almost surely, 2^123011620 is an apocalyptic number.

123011620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123011620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134719200).

123011620 is an abundant number, since it is smaller than the sum of its proper divisors (146426780).

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

123011620 is a wasteful number, since it uses less digits than its factorization.

123011620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 123011620 is about 11091.0603640950. The cubic root of 123011620 is about 497.3346436646.

Adding to 123011620 its reverse (26110321), we get a palindrome (149121941).

The spelling of 123011620 in words is "one hundred twenty-three million, eleven thousand, six hundred twenty".