239927381 has 2 divisors, whose sum is σ = 239927382. Its totient is φ = 239927380.

The previous prime is 239927377. The next prime is 239927407. The reversal of 239927381 is 183729932.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208947025 + 30980356 = 14455^2 + 5566^2 .

It is a cyclic number.

It is not a de Polignac number, because 239927381 - 2² = 239927377 is a prime.

It is a super-2 number, since 2×239927381² = 115130296307038322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239927581) 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, 119963690 + 119963691.

It is an arithmetic number, because the mean of its divisors is an integer number (119963691).

Almost surely, 2^239927381 is an apocalyptic number.

It is an amenable number.

239927381 is a deficient number, since it is larger than the sum of its proper divisors (1).

239927381 is an equidigital number, since it uses as much as digits as its factorization.

239927381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 239927381 is about 15489.5894393622. The cubic root of 239927381 is about 621.3838159464.

The spelling of 239927381 in words is "two hundred thirty-nine million, nine hundred twenty-seven thousand, three hundred eighty-one".