1321303040 has 44 divisors (see below), whose sum is σ = 3169591176. Its totient is φ = 528519168.

The previous prime is 1321303033. The next prime is 1321303043. The reversal of 1321303040 is 403031231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321303043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123914 + ... + 134153.

Almost surely, 2^1321303040 is an apocalyptic number.

1321303040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321303040 is an abundant number, since it is smaller than the sum of its proper divisors (1848288136).

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

1321303040 is an equidigital number, since it uses as much as digits as its factorization.

1321303040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258092 (or 258074 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1321303040 is about 36349.7323236362. The cubic root of 1321303040 is about 1097.3221474522.

Adding to 1321303040 its reverse (403031231), we get a palindrome (1724334271).

Subtracting from 1321303040 its reverse (403031231), we obtain a square (918271809 = 30303²).

The spelling of 1321303040 in words is "one billion, three hundred twenty-one million, three hundred three thousand, forty".