1318780409 has 8 divisors (see below), whose sum is σ = 1324631880. Its totient is φ = 1312942336.

The previous prime is 1318780403. The next prime is 1318780469. The reversal of 1318780409 is 9040878131.

It can be written as a sum of positive squares in 4 ways, for example, as 157879225 + 1160901184 = 12565^2 + 34072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1318780409 - 2¹² = 1318776313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318780403) 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, 227819 + ... + 233535.

It is an arithmetic number, because the mean of its divisors is an integer number (165578985).

Almost surely, 2^1318780409 is an apocalyptic number.

It is an amenable number.

1318780409 is a deficient number, since it is larger than the sum of its proper divisors (5851471).

1318780409 is an equidigital number, since it uses as much as digits as its factorization.

1318780409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6699.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 1318780409 is about 36315.0163018000. The cubic root of 1318780409 is about 1096.6233669564.

The spelling of 1318780409 in words is "one billion, three hundred eighteen million, seven hundred eighty thousand, four hundred nine".