1261218 has 16 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 360336.

The previous prime is 1261217. The next prime is 1261223. The reversal of 1261218 is 8121621.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1261194 and 1261203.

It is not an unprimeable number, because it can be changed into a prime (1261217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14973 + ... + 15056.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^1261218 is an apocalyptic number.

1261218 is an abundant number, since it is smaller than the sum of its proper divisors (1621662).

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

1261218 is a wasteful number, since it uses less digits than its factorization.

1261218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30041.

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

The square root of 1261218 is about 1123.0396253027. The cubic root of 1261218 is about 108.0430212692.

Adding to 1261218 its reverse (8121621), we get a palindrome (9382839).

The spelling of 1261218 in words is "one million, two hundred sixty-one thousand, two hundred eighteen".