338781 has 4 divisors (see below), whose sum is σ = 451712. Its totient is φ = 225852.

The previous prime is 338777. The next prime is 338791. The reversal of 338781 is 187833.

338781 is nontrivially palindromic in base 15.

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 not a de Polignac number, because 338781 - 2² = 338777 is a prime.

It is a super-2 number, since 2×338781² = 229545131922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 338781.

It is not an unprimeable number, because it can be changed into a prime (338731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56461 + ... + 56466.

It is an arithmetic number, because the mean of its divisors is an integer number (112928).

2³³⁸⁷⁸¹ is an apocalyptic number.

It is an amenable number.

338781 is a deficient number, since it is larger than the sum of its proper divisors (112931).

338781 is a wasteful number, since it uses less digits than its factorization.

338781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112930.

The product of its digits is 4032, while the sum is 30.

The square root of 338781 is about 582.0489670122. The cubic root of 338781 is about 69.7118083336.

The spelling of 338781 in words is "three hundred thirty-eight thousand, seven hundred eighty-one".