765378239 has 2 divisors, whose sum is σ = 765378240. Its totient is φ = 765378238.

The previous prime is 765378223. The next prime is 765378253. The reversal of 765378239 is 932873567.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 765378239 - 2⁴ = 765378223 is a prime.

It is a super-2 number, since 2×765378239² = 1171607697469482242, 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 (765378259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382689119 + 382689120.

It is an arithmetic number, because the mean of its divisors is an integer number (382689120).

Almost surely, 2^765378239 is an apocalyptic number.

765378239 is a deficient number, since it is larger than the sum of its proper divisors (1).

765378239 is an equidigital number, since it uses as much as digits as its factorization.

765378239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 50.

The square root of 765378239 is about 27665.4701568580. The cubic root of 765378239 is about 914.7281340676.

The spelling of 765378239 in words is "seven hundred sixty-five million, three hundred seventy-eight thousand, two hundred thirty-nine".