1218015 has 12 divisors (see below), whose sum is σ = 2111304. Its totient is φ = 649584.

The previous prime is 1217989. The next prime is 1218017. The reversal of 1218015 is 5108121.

It is not a de Polignac number, because 1218015 - 2⁸ = 1217759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13489 + ... + 13578.

It is an arithmetic number, because the mean of its divisors is an integer number (175942).

2^1218015 is an apocalyptic number.

1218015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1218015 is a deficient number, since it is larger than the sum of its proper divisors (893289).

1218015 is a wasteful number, since it uses less digits than its factorization.

1218015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27078 (or 27075 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1218015 is about 1103.6371686383. The cubic root of 1218015 is about 106.7949898756.

The spelling of 1218015 in words is "one million, two hundred eighteen thousand, fifteen".