1216618 has 16 divisors (see below), whose sum is σ = 1995336. Its totient is φ = 552960.

The previous prime is 1216603. The next prime is 1216619. The reversal of 1216618 is 8166121.

It can be written as a sum of positive squares in 4 ways, for example, as 1096209 + 120409 = 1047^2 + 347^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216592 and 1216601.

It is not an unprimeable number, because it can be changed into a prime (1216619) 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, 1578 + ... + 2218.

2^1216618 is an apocalyptic number.

1216618 is a deficient number, since it is larger than the sum of its proper divisors (778718).

1216618 is a wasteful number, since it uses less digits than its factorization.

1216618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its digits is 576, while the sum is 25.

The square root of 1216618 is about 1103.0040797749. The cubic root of 1216618 is about 106.7541448187.

The spelling of 1216618 in words is "one million, two hundred sixteen thousand, six hundred eighteen".