1218918 has 16 divisors (see below), whose sum is σ = 2451456. Its totient is φ = 404040.

The previous prime is 1218913. The next prime is 1218923. The reversal of 1218918 is 8198121.

It is an interprime number because it is at equal distance from previous prime (1218913) and next prime (1218923).

It is a super-2 number, since 2×1218918² = 2971522181448, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218911) 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, 883 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (153216).

2^1218918 is an apocalyptic number.

1218918 is an abundant number, since it is smaller than the sum of its proper divisors (1232538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218918 is a wasteful number, since it uses less digits than its factorization.

1218918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its digits is 1152, while the sum is 30.

The square root of 1218918 is about 1104.0461946857. The cubic root of 1218918 is about 106.8213748967.

The spelling of 1218918 in words is "one million, two hundred eighteen thousand, nine hundred eighteen".