1218159 has 16 divisors (see below), whose sum is σ = 1830240. Its totient is φ = 810648.

The previous prime is 1218157. The next prime is 1218167. The reversal of 1218159 is 9518121.

It is not a de Polignac number, because 1218159 - 2¹ = 1218157 is a prime.

It is a super-2 number, since 2×1218159² = 2967822698562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

1218159 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1909 + ... + 2465.

It is an arithmetic number, because the mean of its divisors is an integer number (114390).

2^1218159 is an apocalyptic number.

1218159 is a deficient number, since it is larger than the sum of its proper divisors (612081).

1218159 is an frugal number, since it uses more digits than its factorization.

1218159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 560 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1218159 is about 1103.7024055424. The cubic root of 1218159 is about 106.7991983275.

The spelling of 1218159 in words is "one million, two hundred eighteen thousand, one hundred fifty-nine".