765225391 has 8 divisors (see below), whose sum is σ = 875142560. Its totient is φ = 655458048.

The previous prime is 765225371. The next prime is 765225397. The reversal of 765225391 is 193522567.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 765225391 - 2²⁹ = 228354479 is a prime.

It is a super-2 number, since 2×765225391² = 1171139798062205762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765225397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26286 + ... + 47131.

It is an arithmetic number, because the mean of its divisors is an integer number (109392820).

Almost surely, 2^765225391 is an apocalyptic number.

765225391 is a deficient number, since it is larger than the sum of its proper divisors (109917169).

765225391 is a wasteful number, since it uses less digits than its factorization.

765225391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74913.

The product of its digits is 113400, while the sum is 40.

The square root of 765225391 is about 27662.7075862071. The cubic root of 765225391 is about 914.6672388279.

The spelling of 765225391 in words is "seven hundred sixty-five million, two hundred twenty-five thousand, three hundred ninety-one".