123689620 has 96 divisors (see below), whose sum is σ = 297198720. Its totient is φ = 42946560.

The previous prime is 123689609. The next prime is 123689627. The reversal of 123689620 is 26986321.

It is a self number, because there is not a number n which added to its sum of digits gives 123689620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123689627) 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, 264627 + ... + 265093.

It is an arithmetic number, because the mean of its divisors is an integer number (3095820).

Almost surely, 2^123689620 is an apocalyptic number.

123689620 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 123689620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148599360).

123689620 is an abundant number, since it is smaller than the sum of its proper divisors (173509100).

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

123689620 is a wasteful number, since it uses less digits than its factorization.

123689620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 123689620 is about 11121.5835203446. The cubic root of 123689620 is about 498.2466856306.

The spelling of 123689620 in words is "one hundred twenty-three million, six hundred eighty-nine thousand, six hundred twenty".