1318810442 has 4 divisors (see below), whose sum is σ = 1978215666. Its totient is φ = 659405220.

The previous prime is 1318810439. The next prime is 1318810447. The reversal of 1318810442 is 2440188131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2440188131 = 83 ⋅29399857.

It can be written as a sum of positive squares in only one way, i.e., 1280852521 + 37957921 = 35789^2 + 6161^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1318810399 and 1318810408.

It is not an unprimeable number, because it can be changed into a prime (1318810447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329702609 + ... + 329702612.

Almost surely, 2^1318810442 is an apocalyptic number.

1318810442 is a deficient number, since it is larger than the sum of its proper divisors (659405224).

1318810442 is an equidigital number, since it uses as much as digits as its factorization.

1318810442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659405223.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1318810442 is about 36315.4298060755. The cubic root of 1318810442 is about 1096.6316914759.

Adding to 1318810442 its reverse (2440188131), we get a palindrome (3758998573).

The spelling of 1318810442 in words is "one billion, three hundred eighteen million, eight hundred ten thousand, four hundred forty-two".