123180520 has 16 divisors (see below), whose sum is σ = 277156260. Its totient is φ = 49272192.

The previous prime is 123180493. The next prime is 123180529. The reversal of 123180520 is 25081321.

It can be written as a sum of positive squares in 2 ways, for example, as 123076836 + 103684 = 11094^2 + 322^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123180491 and 123180500.

It is not an unprimeable number, because it can be changed into a prime (123180529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539717 + ... + 1539796.

Almost surely, 2^123180520 is an apocalyptic number.

123180520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123180520 is an abundant number, since it is smaller than the sum of its proper divisors (153975740).

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

123180520 is a wasteful number, since it uses less digits than its factorization.

123180520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079524 (or 3079520 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 123180520 is about 11098.6719926305. The cubic root of 123180520 is about 497.5621598552.

The spelling of 123180520 in words is "one hundred twenty-three million, one hundred eighty thousand, five hundred twenty".