1221627746 has 16 divisors (see below), whose sum is σ = 1850929080. Its totient is φ = 604661760.

The previous prime is 1221627739. The next prime is 1221627749. The reversal of 1221627746 is 6477261221.

It can be written as a sum of positive squares in 4 ways, for example, as 958831225 + 262796521 = 30965^2 + 16211^2 .

It is not an unprimeable number, because it can be changed into a prime (1221627749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351650 + ... + 355106.

Almost surely, 2^1221627746 is an apocalyptic number.

1221627746 is a deficient number, since it is larger than the sum of its proper divisors (629301334).

1221627746 is a wasteful number, since it uses less digits than its factorization.

1221627746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189.

The product of its digits is 56448, while the sum is 38.

The square root of 1221627746 is about 34951.7917423413. The cubic root of 1221627746 is about 1069.0047361691.

Adding to 1221627746 its reverse (6477261221), we get a palindrome (7698888967).

The spelling of 1221627746 in words is "one billion, two hundred twenty-one million, six hundred twenty-seven thousand, seven hundred forty-six".