1218713 has 6 divisors (see below), whose sum is σ = 1294926. Its totient is φ = 1146752.

The previous prime is 1218709. The next prime is 1218727. The reversal of 1218713 is 3178121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 760384 + 458329 = 872^2 + 677^2 .

It is not a de Polignac number, because 1218713 - 2² = 1218709 is a prime.

It is a super-3 number, since 3×1218713³ = 5430322043336379291, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1218773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1820 + ... + 2397.

It is an arithmetic number, because the mean of its divisors is an integer number (215821).

2^1218713 is an apocalyptic number.

It is an amenable number.

1218713 is a deficient number, since it is larger than the sum of its proper divisors (76213).

1218713 is an equidigital number, since it uses as much as digits as its factorization.

1218713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251 (or 4234 counting only the distinct ones).

The product of its digits is 336, while the sum is 23.

The square root of 1218713 is about 1103.9533504637. The cubic root of 1218713 is about 106.8153860854.

The spelling of 1218713 in words is "one million, two hundred eighteen thousand, seven hundred thirteen".