1216918 has 4 divisors (see below), whose sum is σ = 1825380. Its totient is φ = 608458.

The previous prime is 1216913. The next prime is 1216937. The reversal of 1216918 is 8196121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8196121 = 31 ⋅264391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304228 + ... + 304231.

It is an arithmetic number, because the mean of its divisors is an integer number (456345).

2^1216918 is an apocalyptic number.

1216918 is a deficient number, since it is larger than the sum of its proper divisors (608462).

1216918 is an equidigital number, since it uses as much as digits as its factorization.

1216918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608461.

The product of its digits is 864, while the sum is 28.

The square root of 1216918 is about 1103.1400636365. The cubic root of 1216918 is about 106.7629187619.

The spelling of 1216918 in words is "one million, two hundred sixteen thousand, nine hundred eighteen".