239447389 has 2 divisors, whose sum is σ = 239447390. Its totient is φ = 239447388.

The previous prime is 239447381. The next prime is 239447407. The reversal of 239447389 is 983744932.

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., 192044164 + 47403225 = 13858^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 239447389 - 2³ = 239447381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239447381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119723694 + 119723695.

It is an arithmetic number, because the mean of its divisors is an integer number (119723695).

Almost surely, 2^239447389 is an apocalyptic number.

It is an amenable number.

239447389 is a deficient number, since it is larger than the sum of its proper divisors (1).

239447389 is an equidigital number, since it uses as much as digits as its factorization.

239447389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 239447389 is about 15474.0876629286. The cubic root of 239447389 is about 620.9691649563.

The spelling of 239447389 in words is "two hundred thirty-nine million, four hundred forty-seven thousand, three hundred eighty-nine".