1231322420 has 24 divisors (see below), whose sum is σ = 2590980000. Its totient is φ = 491537952.

The previous prime is 1231322419. The next prime is 1231322459. The reversal of 1231322420 is 242231321.

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 = 1231322392 and 1231322401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51710 + ... + 71669.

It is an arithmetic number, because the mean of its divisors is an integer number (107957500).

Almost surely, 2^1231322420 is an apocalyptic number.

1231322420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231322420 is an abundant number, since it is smaller than the sum of its proper divisors (1359657580).

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

1231322420 is a wasteful number, since it uses less digits than its factorization.

1231322420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123887 (or 123885 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1231322420 is about 35090.2040461437. The cubic root of 1231322420 is about 1071.8251146449.

Adding to 1231322420 its reverse (242231321), we get a palindrome (1473553741).

The spelling of 1231322420 in words is "one billion, two hundred thirty-one million, three hundred twenty-two thousand, four hundred twenty".