238781 has 2 divisors, whose sum is σ = 238782. Its totient is φ = 238780.

The previous prime is 238759. The next prime is 238789. The reversal of 238781 is 187832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 116281 = 350^2 + 341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238781 is a prime.

It is a super-2 number, since 2×238781² = 114032731922, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238789) 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 as a sum of consecutive naturals, namely, 119390 + 119391.

It is an arithmetic number, because the mean of its divisors is an integer number (119391).

2²³⁸⁷⁸¹ is an apocalyptic number.

It is an amenable number.

238781 is a deficient number, since it is larger than the sum of its proper divisors (1).

238781 is an equidigital number, since it uses as much as digits as its factorization.

238781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 238781 is about 488.6522280723. The cubic root of 238781 is about 62.0392571359.

It can be divided in two parts, 2 and 38781, that added together give a palindrome (38783).

The spelling of 238781 in words is "two hundred thirty-eight thousand, seven hundred eighty-one".