1221626 has 16 divisors (see below), whose sum is σ = 2125440. Its totient is φ = 515760.

The previous prime is 1221601. The next prime is 1221631. The reversal of 1221626 is 6261221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221598 and 1221607.

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, 380 + ... + 1608.

It is an arithmetic number, because the mean of its divisors is an integer number (132840).

2^1221626 is an apocalyptic number.

1221626 is a deficient number, since it is larger than the sum of its proper divisors (903814).

1221626 is a wasteful number, since it uses less digits than its factorization.

1221626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309.

The product of its digits is 288, while the sum is 20.

The square root of 1221626 is about 1105.2719122460. The cubic root of 1221626 is about 106.9004226881.

Adding to 1221626 its reverse (6261221), we get a palindrome (7482847).

The spelling of 1221626 in words is "one million, two hundred twenty-one thousand, six hundred twenty-six".