238626981 has 6 divisors (see below), whose sum is σ = 344683430. Its totient is φ = 159084648.

The previous prime is 238626979. The next prime is 238626989. The reversal of 238626981 is 189626832.

238626981 is a `hidden beast` number, since 2 + 386 + 269 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 238424481 + 202500 = 15441^2 + 450^2 .

It is not a de Polignac number, because 238626981 - 2¹ = 238626979 is a prime.

It is a super-2 number, since 2×238626981² = 113885672122348722, 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 (238626989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13257046 + ... + 13257063.

Almost surely, 2^238626981 is an apocalyptic number.

It is an amenable number.

238626981 is a deficient number, since it is larger than the sum of its proper divisors (106056449).

238626981 is a wasteful number, since it uses less digits than its factorization.

238626981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26514115 (or 26514112 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 238626981 is about 15447.5558260846. Note that the first 3 decimals coincide. The cubic root of 238626981 is about 620.2591537147.

The spelling of 238626981 in words is "two hundred thirty-eight million, six hundred twenty-six thousand, nine hundred eighty-one".