1338542449 has 4 divisors (see below), whose sum is σ = 1338855280. Its totient is φ = 1338229620.

The previous prime is 1338542423. The next prime is 1338542497. The reversal of 1338542449 is 9442458331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1338542449 - 2⁵ = 1338542417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338542749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149907 + ... + 158584.

It is an arithmetic number, because the mean of its divisors is an integer number (334713820).

Almost surely, 2^1338542449 is an apocalyptic number.

It is an amenable number.

1338542449 is a deficient number, since it is larger than the sum of its proper divisors (312831).

1338542449 is an equidigital number, since it uses as much as digits as its factorization.

1338542449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312830.

The product of its digits is 414720, while the sum is 43.

The square root of 1338542449 is about 36586.0963892023. The cubic root of 1338542449 is about 1102.0738971397.

The spelling of 1338542449 in words is "one billion, three hundred thirty-eight million, five hundred forty-two thousand, four hundred forty-nine".