1218216 has 32 divisors (see below), whose sum is σ = 3072960. Its totient is φ = 402432.

The previous prime is 1218211. The next prime is 1218221. The reversal of 1218216 is 6128121.

It is an interprime number because it is at equal distance from previous prime (1218211) and next prime (1218221).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1218192 and 1218201.

It is not an unprimeable number, because it can be changed into a prime (1218211) 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, 4501 + ... + 4763.

It is an arithmetic number, because the mean of its divisors is an integer number (96030).

2^1218216 is an apocalyptic number.

It is an amenable number.

1218216 is an abundant number, since it is smaller than the sum of its proper divisors (1854744).

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

1218216 is a wasteful number, since it uses less digits than its factorization.

1218216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 461 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

The square root of 1218216 is about 1103.7282274183. The cubic root of 1218216 is about 106.8008640814.

The spelling of 1218216 in words is "one million, two hundred eighteen thousand, two hundred sixteen".