1321749008 has 20 divisors (see below), whose sum is σ = 2649196140. Its totient is φ = 638085504.

The previous prime is 1321748971. The next prime is 1321749017. The reversal of 1321749008 is 8009471231.

It can be written as a sum of positive squares in 2 ways, for example, as 782209024 + 539539984 = 27968^2 + 23228^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1423835 + ... + 1424762.

It is an arithmetic number, because the mean of its divisors is an integer number (132459807).

Almost surely, 2^1321749008 is an apocalyptic number.

It is an amenable number.

1321749008 is an abundant number, since it is smaller than the sum of its proper divisors (1327447132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321749008 is a wasteful number, since it uses less digits than its factorization.

1321749008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848634 (or 2848628 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1321749008 is about 36355.8662116583. The cubic root of 1321749008 is about 1097.4455901199.

The spelling of 1321749008 in words is "one billion, three hundred twenty-one million, seven hundred forty-nine thousand, eight".