1440123313 has 4 divisors (see below), whose sum is σ = 1450635300. Its totient is φ = 1429611328.

The previous prime is 1440123263. The next prime is 1440123359. The reversal of 1440123313 is 3133210441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3133210441 = 313 ⋅10010257.

It can be written as a sum of positive squares in 2 ways, for example, as 488277409 + 951845904 = 22097^2 + 30852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440123313 - 2¹⁷ = 1439992241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440123913) 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, 5255788 + ... + 5256061.

It is an arithmetic number, because the mean of its divisors is an integer number (362658825).

Almost surely, 2^1440123313 is an apocalyptic number.

It is an amenable number.

1440123313 is a deficient number, since it is larger than the sum of its proper divisors (10511987).

1440123313 is a wasteful number, since it uses less digits than its factorization.

1440123313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511986.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1440123313 is about 37948.9566786756. The cubic root of 1440123313 is about 1129.2754676193.

Adding to 1440123313 its reverse (3133210441), we get a palindrome (4573333754).

The spelling of 1440123313 in words is "one billion, four hundred forty million, one hundred twenty-three thousand, three hundred thirteen".