123156620 has 48 divisors (see below), whose sum is σ = 274125600. Its totient is φ = 46394880.

The previous prime is 123156571. The next prime is 123156623. The reversal of 123156620 is 26651321.

It is a self number, because there is not a number n which added to its sum of digits gives 123156620.

It is not an unprimeable number, because it can be changed into a prime (123156623) 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, 21191 + ... + 26369.

It is an arithmetic number, because the mean of its divisors is an integer number (5710950).

Almost surely, 2^123156620 is an apocalyptic number.

123156620 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 123156620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137062800).

123156620 is an abundant number, since it is smaller than the sum of its proper divisors (150968980).

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

123156620 is a wasteful number, since it uses less digits than its factorization.

123156620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258 (or 5256 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 123156620 is about 11097.5952350047. The cubic root of 123156620 is about 497.5299780762.

The spelling of 123156620 in words is "one hundred twenty-three million, one hundred fifty-six thousand, six hundred twenty".