1320636442 has 4 divisors (see below), whose sum is σ = 1980954666. Its totient is φ = 660318220.

The previous prime is 1320636437. The next prime is 1320636451. The reversal of 1320636442 is 2446360231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1126340721 + 194295721 = 33561^2 + 13939^2 .

It is a super-2 number, since 2×1320636442² = 3488161223876838728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330159109 + ... + 330159112.

Almost surely, 2^1320636442 is an apocalyptic number.

1320636442 is a deficient number, since it is larger than the sum of its proper divisors (660318224).

1320636442 is an equidigital number, since it uses as much as digits as its factorization.

1320636442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660318223.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1320636442 is about 36340.5619384181. The cubic root of 1320636442 is about 1097.1375832327.

Adding to 1320636442 its reverse (2446360231), we get a palindrome (3766996673).

The spelling of 1320636442 in words is "one billion, three hundred twenty million, six hundred thirty-six thousand, four hundred forty-two".