1221677444 has 24 divisors (see below), whose sum is σ = 2312468760. Its totient is φ = 561383424.

The previous prime is 1221677393. The next prime is 1221677449. The reversal of 1221677444 is 4447761221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 431392900 + 790284544 = 20770^2 + 28112^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221677398 and 1221677407.

It is not an unprimeable number, because it can be changed into a prime (1221677449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39389 + ... + 63204.

It is an arithmetic number, because the mean of its divisors is an integer number (96352865).

Almost surely, 2^1221677444 is an apocalyptic number.

It is an amenable number.

1221677444 is a deficient number, since it is larger than the sum of its proper divisors (1090791316).

1221677444 is a wasteful number, since it uses less digits than its factorization.

1221677444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102839 (or 102837 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 1221677444 is about 34952.5026857878. The cubic root of 1221677444 is about 1069.0192323136.

The spelling of 1221677444 in words is "one billion, two hundred twenty-one million, six hundred seventy-seven thousand, four hundred forty-four".