1320423040 has 64 divisors (see below), whose sum is σ = 3233691720. Its totient is φ = 515276800.

The previous prime is 1320423037. The next prime is 1320423043. The reversal of 1320423040 is 403240231.

It is an interprime number because it is at equal distance from previous prime (1320423037) and next prime (1320423043).

It can be written as a sum of positive squares in 4 ways, for example, as 846577216 + 473845824 = 29096^2 + 21768^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1320422999 and 1320423017.

It is not an unprimeable number, because it can be changed into a prime (1320423043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 51400.

Almost surely, 2^1320423040 is an apocalyptic number.

1320423040 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 1320423040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616845860).

1320423040 is an abundant number, since it is smaller than the sum of its proper divisors (1913268680).

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

1320423040 is an equidigital number, since it uses as much as digits as its factorization.

1320423040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50381 (or 50369 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1320423040 is about 36337.6256791772. The cubic root of 1320423040 is about 1097.0784844630.

Adding to 1320423040 its reverse (403240231), we get a palindrome (1723663271).

The spelling of 1320423040 in words is "one billion, three hundred twenty million, four hundred twenty-three thousand, forty".