1226321644 has 24 divisors (see below), whose sum is σ = 2249544528. Its totient is φ = 584290560.

The previous prime is 1226321641. The next prime is 1226321669. The reversal of 1226321644 is 4461236221.

It is not an unprimeable number, because it can be changed into a prime (1226321641) 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, 79897 + ... + 94000.

It is an arithmetic number, because the mean of its divisors is an integer number (93731022).

Almost surely, 2^1226321644 is an apocalyptic number.

It is an amenable number.

1226321644 is a deficient number, since it is larger than the sum of its proper divisors (1023222884).

1226321644 is a wasteful number, since it uses less digits than its factorization.

1226321644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173985 (or 173983 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 1226321644 is about 35018.8755387719. The cubic root of 1226321644 is about 1070.3721429512.

Adding to 1226321644 its reverse (4461236221), we get a palindrome (5687557865).

The spelling of 1226321644 in words is "one billion, two hundred twenty-six million, three hundred twenty-one thousand, six hundred forty-four".