1320421405 has 32 divisors (see below), whose sum is σ = 1660861440. Its totient is φ = 1006836480.

The previous prime is 1320421373. The next prime is 1320421439. The reversal of 1320421405 is 5041240231.

It is not a de Polignac number, because 1320421405 - 2⁵ = 1320421373 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2440435 + ... + 2440975.

It is an arithmetic number, because the mean of its divisors is an integer number (51901920).

Almost surely, 2^1320421405 is an apocalyptic number.

It is an amenable number.

1320421405 is a deficient number, since it is larger than the sum of its proper divisors (340440035).

1320421405 is a wasteful number, since it uses less digits than its factorization.

1320421405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1320421405 is about 36337.6031818280. The cubic root of 1320421405 is about 1097.0780316475.

Adding to 1320421405 its reverse (5041240231), we get a palindrome (6361661636).

The spelling of 1320421405 in words is "one billion, three hundred twenty million, four hundred twenty-one thousand, four hundred five".