765638239 has 2 divisors, whose sum is σ = 765638240. Its totient is φ = 765638238.

The previous prime is 765638201. The next prime is 765638261. The reversal of 765638239 is 932836567.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 765638239 - 2⁹ = 765637727 is a prime.

It is a super-2 number, since 2×765638239² = 1172403826038042242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 765638192 and 765638201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765632239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382819119 + 382819120.

It is an arithmetic number, because the mean of its divisors is an integer number (382819120).

Almost surely, 2^765638239 is an apocalyptic number.

765638239 is a deficient number, since it is larger than the sum of its proper divisors (1).

765638239 is an equidigital number, since it uses as much as digits as its factorization.

765638239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 49.

The square root of 765638239 is about 27670.1687562617. The cubic root of 765638239 is about 914.8317004602.

The spelling of 765638239 in words is "seven hundred sixty-five million, six hundred thirty-eight thousand, two hundred thirty-nine".