238871981 has 4 divisors (see below), whose sum is σ = 252923292. Its totient is φ = 224820672.

The previous prime is 238871939. The next prime is 238871989. The reversal of 238871981 is 189178832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167469481 + 71402500 = 12941^2 + 8450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238871981 is a prime.

It is a super-2 number, since 2×238871981² = 114119646613728722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238871989) 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 3 ways as a sum of consecutive naturals, for example, 7025630 + ... + 7025663.

It is an arithmetic number, because the mean of its divisors is an integer number (63230823).

Almost surely, 2^238871981 is an apocalyptic number.

It is an amenable number.

238871981 is a deficient number, since it is larger than the sum of its proper divisors (14051311).

238871981 is a wasteful number, since it uses less digits than its factorization.

238871981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051310.

The product of its digits is 193536, while the sum is 47.

The square root of 238871981 is about 15455.4838487833. The cubic root of 238871981 is about 620.4713559202.

The spelling of 238871981 in words is "two hundred thirty-eight million, eight hundred seventy-one thousand, nine hundred eighty-one".