1232400520 has 128 divisors (see below), whose sum is σ = 3080579040. Its totient is φ = 440893440.

The previous prime is 1232400497. The next prime is 1232400523. The reversal of 1232400520 is 250042321.

It can be written as a sum of positive squares in 16 ways, for example, as 18714276 + 1213686244 = 4326^2 + 34838^2 .

It is a super-2 number, since 2×1232400520² = 3037622083392540800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1232400523) 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 31 ways as a sum of consecutive naturals, for example, 2673090 + ... + 2673550.

Almost surely, 2^1232400520 is an apocalyptic number.

1232400520 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 1232400520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1540289520).

1232400520 is an abundant number, since it is smaller than the sum of its proper divisors (1848178520).

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

1232400520 is a wasteful number, since it uses less digits than its factorization.

1232400520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1232400520 is about 35105.5625221987. The cubic root of 1232400520 is about 1072.1378400946.

Adding to 1232400520 its reverse (250042321), we get a palindrome (1482442841).

The spelling of 1232400520 in words is "one billion, two hundred thirty-two million, four hundred thousand, five hundred twenty".