1440313 has 4 divisors (see below), whose sum is σ = 1646080. Its totient is φ = 1234548.

The previous prime is 1440301. The next prime is 1440317. The reversal of 1440313 is 3130441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3130441 = 67 ⋅46723.

It is a de Polignac number, because none of the positive numbers 2^k-1440313 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440317) 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 3 ways as a sum of consecutive naturals, for example, 102873 + ... + 102886.

It is an arithmetic number, because the mean of its divisors is an integer number (411520).

2^1440313 is an apocalyptic number.

It is an amenable number.

1440313 is a deficient number, since it is larger than the sum of its proper divisors (205767).

1440313 is an equidigital number, since it uses as much as digits as its factorization.

1440313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205766.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1440313 is about 1200.1304095806. The cubic root of 1440313 is about 112.9325046585.

Adding to 1440313 its reverse (3130441), we get a palindrome (4570754).

The spelling of 1440313 in words is "one million, four hundred forty thousand, three hundred thirteen".