1243231020 has 72 divisors (see below), whose sum is σ = 3774083040. Its totient is φ = 331269120.

The previous prime is 1243231019. The next prime is 1243231027. The reversal of 1243231020 is 201323421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1243230984 and 1243231002.

It is not an unprimeable number, because it can be changed into a prime (1243231027) 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 23 ways as a sum of consecutive naturals, for example, 372921 + ... + 376239.

It is an arithmetic number, because the mean of its divisors is an integer number (52417820).

Almost surely, 2^1243231020 is an apocalyptic number.

1243231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243231020 is an abundant number, since it is smaller than the sum of its proper divisors (2530852020).

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

1243231020 is a wasteful number, since it uses less digits than its factorization.

1243231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415 (or 5410 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1243231020 is about 35259.4812780903. The cubic root of 1243231020 is about 1075.2693812019.

Adding to 1243231020 its reverse (201323421), we get a palindrome (1444554441).

The spelling of 1243231020 in words is "one billion, two hundred forty-three million, two hundred thirty-one thousand, twenty".