1338543421 has 4 divisors (see below), whose sum is σ = 1350389052. Its totient is φ = 1326697792.

The previous prime is 1338543391. The next prime is 1338543439. The reversal of 1338543421 is 1243458331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 423783396 + 914760025 = 20586^2 + 30245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338543421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338544421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5922646 + ... + 5922871.

It is an arithmetic number, because the mean of its divisors is an integer number (337597263).

Almost surely, 2^1338543421 is an apocalyptic number.

It is an amenable number.

1338543421 is a deficient number, since it is larger than the sum of its proper divisors (11845631).

1338543421 is a wasteful number, since it uses less digits than its factorization.

1338543421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11845630.

The product of its digits is 34560, while the sum is 34.

The square root of 1338543421 is about 36586.1096729346. The cubic root of 1338543421 is about 1102.0741639014.

The spelling of 1338543421 in words is "one billion, three hundred thirty-eight million, five hundred forty-three thousand, four hundred twenty-one".