1338943881 has 32 divisors (see below), whose sum is σ = 1989134208. Its totient is φ = 794327040.

The previous prime is 1338943877. The next prime is 1338943951. The reversal of 1338943881 is 1883498331.

It is not a de Polignac number, because 1338943881 - 2² = 1338943877 is a prime.

It is a super-2 number, since 2×1338943881² = 3585541432934684322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1338943881.

It is not an unprimeable number, because it can be changed into a prime (1338943811) 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 31 ways as a sum of consecutive naturals, for example, 328005 + ... + 332061.

It is an arithmetic number, because the mean of its divisors is an integer number (62160444).

Almost surely, 2^1338943881 is an apocalyptic number.

1338943881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1338943881 is a deficient number, since it is larger than the sum of its proper divisors (650190327).

1338943881 is a wasteful number, since it uses less digits than its factorization.

1338943881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281.

The product of its digits is 497664, while the sum is 48.

The square root of 1338943881 is about 36591.5821057248. The cubic root of 1338943881 is about 1102.1840576381.

The spelling of 1338943881 in words is "one billion, three hundred thirty-eight million, nine hundred forty-three thousand, eight hundred eighty-one".