123509880 has 256 divisors, whose sum is σ = 467712000. Its totient is φ = 28740096.

The previous prime is 123509873. The next prime is 123509929. The reversal of 123509880 is 88905321.

It is a super-2 number, since 2×123509880² = 30509380915228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 266529 + ... + 266991.

It is an arithmetic number, because the mean of its divisors is an integer number (1827000).

Almost surely, 2^123509880 is an apocalyptic number.

123509880 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 123509880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233856000).

123509880 is an abundant number, since it is smaller than the sum of its proper divisors (344202120).

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

123509880 is a wasteful number, since it uses less digits than its factorization.

123509880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 123509880 is about 11113.4998987718. The cubic root of 123509880 is about 498.0052256673.

The spelling of 123509880 in words is "one hundred twenty-three million, five hundred nine thousand, eight hundred eighty".