239720387 has 2 divisors, whose sum is σ = 239720388. Its totient is φ = 239720386.

The previous prime is 239720381. The next prime is 239720389. The reversal of 239720387 is 783027932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 239720387 - 2¹⁶ = 239654851 is a prime.

Together with 239720389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (239720381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119860193 + 119860194.

It is an arithmetic number, because the mean of its divisors is an integer number (119860194).

Almost surely, 2^239720387 is an apocalyptic number.

239720387 is a deficient number, since it is larger than the sum of its proper divisors (1).

239720387 is an equidigital number, since it uses as much as digits as its factorization.

239720387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 239720387 is about 15482.9062840282. The cubic root of 239720387 is about 621.2050677936.

The spelling of 239720387 in words is "two hundred thirty-nine million, seven hundred twenty thousand, three hundred eighty-seven".