1233400520 has 32 divisors (see below), whose sum is σ = 3027438720. Its totient is φ = 448509120.

The previous prime is 1233400517. The next prime is 1233400529. The reversal of 1233400520 is 250043321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1233400492 and 1233400501.

It is not an unprimeable number, because it can be changed into a prime (1233400529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1401152 + ... + 1402031.

It is an arithmetic number, because the mean of its divisors is an integer number (94607460).

Almost surely, 2^1233400520 is an apocalyptic number.

1233400520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1233400520 is an abundant number, since it is smaller than the sum of its proper divisors (1794038200).

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

1233400520 is a wasteful number, since it uses less digits than its factorization.

1233400520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803205 (or 2803201 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1233400520 is about 35119.8023912436. The cubic root of 1233400520 is about 1072.4277480066.

Adding to 1233400520 its reverse (250043321), we get a palindrome (1483443841).

The spelling of 1233400520 in words is "one billion, two hundred thirty-three million, four hundred thousand, five hundred twenty".