765747421 has 2 divisors, whose sum is σ = 765747422. Its totient is φ = 765747420.

The previous prime is 765747401. The next prime is 765747509. The reversal of 765747421 is 124747567.

765747421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676728196 + 89019225 = 26014^2 + 9435^2 .

It is a cyclic number.

It is not a de Polignac number, because 765747421 - 2¹⁷ = 765616349 is a prime.

It is a super-2 number, since 2×765747421² = 1172738225536302482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765747401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382873710 + 382873711.

It is an arithmetic number, because the mean of its divisors is an integer number (382873711).

Almost surely, 2^765747421 is an apocalyptic number.

It is an amenable number.

765747421 is a deficient number, since it is larger than the sum of its proper divisors (1).

765747421 is an equidigital number, since it uses as much as digits as its factorization.

765747421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329280, while the sum is 43.

The square root of 765747421 is about 27672.1416048704. The cubic root of 765747421 is about 914.8751841849.

The spelling of 765747421 in words is "seven hundred sixty-five million, seven hundred forty-seven thousand, four hundred twenty-one".