1221418 has 16 divisors (see below), whose sum is σ = 2034720. Its totient is φ = 545200.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221418 is 8141221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221395 and 1221404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (127170).

2^1221418 is an apocalyptic number.

1221418 is a deficient number, since it is larger than the sum of its proper divisors (813302).

1221418 is a wasteful number, since it uses less digits than its factorization.

1221418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013.

The product of its digits is 128, while the sum is 19.

The square root of 1221418 is about 1105.1778137476. The cubic root of 1221418 is about 106.8943552146.

Adding to 1221418 its reverse (8141221), we get a palindrome (9362639).

It can be divided in two parts, 122 and 1418, that added together give a triangular number (1540 = T₅₅).

The spelling of 1221418 in words is "one million, two hundred twenty-one thousand, four hundred eighteen".