239630381 has 2 divisors, whose sum is σ = 239630382. Its totient is φ = 239630380.

The previous prime is 239630371. The next prime is 239630401. The reversal of 239630381 is 183036932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214036900 + 25593481 = 14630^2 + 5059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239630381 is a prime.

It is a super-2 number, since 2×239630381² = 114845438996410322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239630371) 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 as a sum of consecutive naturals, namely, 119815190 + 119815191.

It is an arithmetic number, because the mean of its divisors is an integer number (119815191).

Almost surely, 2^239630381 is an apocalyptic number.

It is an amenable number.

239630381 is a deficient number, since it is larger than the sum of its proper divisors (1).

239630381 is an equidigital number, since it uses as much as digits as its factorization.

239630381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 239630381 is about 15479.9993863049. Note that the first 3 decimals coincide. The cubic root of 239630381 is about 621.1273116724.

The spelling of 239630381 in words is "two hundred thirty-nine million, six hundred thirty thousand, three hundred eighty-one".