1221746 has 8 divisors (see below), whose sum is σ = 1837404. Its totient is φ = 609280.

The previous prime is 1221707. The next prime is 1221749. The reversal of 1221746 is 6471221.

It can be written as a sum of positive squares in 2 ways, for example, as 1177225 + 44521 = 1085^2 + 211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806 + ... + 1758.

2^1221746 is an apocalyptic number.

1221746 is a deficient number, since it is larger than the sum of its proper divisors (615658).

1221746 is an equidigital number, since it uses as much as digits as its factorization.

1221746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its digits is 672, while the sum is 23.

The square root of 1221746 is about 1105.3261961973. The cubic root of 1221746 is about 106.9039228402.

Adding to 1221746 its reverse (6471221), we get a palindrome (7692967).

The spelling of 1221746 in words is "one million, two hundred twenty-one thousand, seven hundred forty-six".