123040520 has 16 divisors (see below), whose sum is σ = 276841260. Its totient is φ = 49216192.

The previous prime is 123040517. The next prime is 123040529. The reversal of 123040520 is 25040321.

It can be written as a sum of positive squares in 2 ways, for example, as 122633476 + 407044 = 11074^2 + 638^2 .

It is not an unprimeable number, because it can be changed into a prime (123040529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537967 + ... + 1538046.

Almost surely, 2^123040520 is an apocalyptic number.

123040520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123040520 is an abundant number, since it is smaller than the sum of its proper divisors (153800740).

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

123040520 is a wasteful number, since it uses less digits than its factorization.

123040520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076024 (or 3076020 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 123040520 is about 11092.3631386644. The cubic root of 123040520 is about 497.3735880769.

Adding to 123040520 its reverse (25040321), we get a palindrome (148080841).

The spelling of 123040520 in words is "one hundred twenty-three million, forty thousand, five hundred twenty".