1315442440 has 32 divisors (see below), whose sum is σ = 3187419480. Its totient is φ = 485701632.

The previous prime is 1315442431. The next prime is 1315442449. The reversal of 1315442440 is 442445131.

It is an interprime number because it is at equal distance from previous prime (1315442431) and next prime (1315442449).

It can be written as a sum of positive squares in 4 ways, for example, as 448846596 + 866595844 = 21186^2 + 29438^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1315442399 and 1315442408.

It is not an unprimeable number, because it can be changed into a prime (1315442449) 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, 1264329 + ... + 1265368.

Almost surely, 2^1315442440 is an apocalyptic number.

1315442440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315442440 is an abundant number, since it is smaller than the sum of its proper divisors (1871977040).

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

1315442440 is a wasteful number, since it uses less digits than its factorization.

1315442440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529721 (or 2529717 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1315442440 is about 36269.0286608285. The cubic root of 1315442440 is about 1095.6973630284.

Adding to 1315442440 its reverse (442445131), we get a palindrome (1757887571).

The spelling of 1315442440 in words is "one billion, three hundred fifteen million, four hundred forty-two thousand, four hundred forty".