123424520 has 16 divisors (see below), whose sum is σ = 277705260. Its totient is φ = 49369792.

The previous prime is 123424501. The next prime is 123424529. The reversal of 123424520 is 25424321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 118504996 + 4919524 = 10886^2 + 2218^2 .

It is a super-2 number, since 2×123424520² = 30467224274460800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123424529) 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, 1542767 + ... + 1542846.

Almost surely, 2^123424520 is an apocalyptic number.

123424520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123424520 is an abundant number, since it is smaller than the sum of its proper divisors (154280740).

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

123424520 is a wasteful number, since it uses less digits than its factorization.

123424520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085624 (or 3085620 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 123424520 is about 11109.6588606491. The cubic root of 123424520 is about 497.8904723026.

Adding to 123424520 its reverse (25424321), we get a palindrome (148848841).

The spelling of 123424520 in words is "one hundred twenty-three million, four hundred twenty-four thousand, five hundred twenty".