1221426 has 16 divisors (see below), whose sum is σ = 2714400. Its totient is φ = 407124.

The previous prime is 1221421. The next prime is 1221427. The reversal of 1221426 is 6241221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221399 and 1221408.

It is not an unprimeable number, because it can be changed into a prime (1221421) 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, 11256 + ... + 11363.

It is an arithmetic number, because the mean of its divisors is an integer number (169650).

2^1221426 is an apocalyptic number.

1221426 is an abundant number, since it is smaller than the sum of its proper divisors (1492974).

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

1221426 is a wasteful number, since it uses less digits than its factorization.

1221426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22630 (or 22624 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1221426 is about 1105.1814330688. The cubic root of 1221426 is about 106.8945885917.

Adding to 1221426 its reverse (6241221), we get a palindrome (7462647).

The spelling of 1221426 in words is "one million, two hundred twenty-one thousand, four hundred twenty-six".