1338243729 has 8 divisors (see below), whose sum is σ = 1810956960. Its totient is φ = 878846496.

The previous prime is 1338243703. The next prime is 1338243761. The reversal of 1338243729 is 9273428331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1338243729 - 2¹⁹ = 1337719441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1338243779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3328764 + ... + 3329165.

It is an arithmetic number, because the mean of its divisors is an integer number (226369620).

Almost surely, 2^1338243729 is an apocalyptic number.

It is an amenable number.

1338243729 is a deficient number, since it is larger than the sum of its proper divisors (472713231).

1338243729 is an equidigital number, since it uses as much as digits as its factorization.

1338243729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657999.

The product of its digits is 217728, while the sum is 42.

The square root of 1338243729 is about 36582.0137362612. The cubic root of 1338243729 is about 1101.9919084543.

The spelling of 1338243729 in words is "one billion, three hundred thirty-eight million, two hundred forty-three thousand, seven hundred twenty-nine".