123676520 has 128 divisors (see below), whose sum is σ = 322548480. Its totient is φ = 42592000.

The previous prime is 123676519. The next prime is 123676559. The reversal of 123676520 is 25676321.

Added to its reverse (25676321) it gives a square (149352841 = 12221²).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1224470 + ... + 1224570.

It is an arithmetic number, because the mean of its divisors is an integer number (2519910).

Almost surely, 2^123676520 is an apocalyptic number.

123676520 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 123676520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161274240).

123676520 is an abundant number, since it is smaller than the sum of its proper divisors (198871960).

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

123676520 is a wasteful number, since it uses less digits than its factorization.

123676520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 123676520 is about 11120.9945598404. The cubic root of 123676520 is about 498.2290951973.

Adding to 123676520 its reverse (25676321), we get a square (149352841 = 12221²).

The spelling of 123676520 in words is "one hundred twenty-three million, six hundred seventy-six thousand, five hundred twenty".