1218985 has 8 divisors (see below), whose sum is σ = 1548936. Its totient is φ = 917760.

The previous prime is 1218953. The next prime is 1218989. The reversal of 1218985 is 5898121.

It can be written as a sum of positive squares in 4 ways, for example, as 24336 + 1194649 = 156^2 + 1093^2 .

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

It is not a de Polignac number, because 1218985 - 2⁵ = 1218953 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218985.

It is not an unprimeable number, because it can be changed into a prime (1218989) 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, 7086 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (193617).

2^1218985 is an apocalyptic number.

It is an amenable number.

1218985 is a deficient number, since it is larger than the sum of its proper divisors (329951).

1218985 is a wasteful number, since it uses less digits than its factorization.

1218985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14363.

The product of its digits is 5760, while the sum is 34.

The square root of 1218985 is about 1104.0765372020. The cubic root of 1218985 is about 106.8233320699.

The spelling of 1218985 in words is "one million, two hundred eighteen thousand, nine hundred eighty-five".