766021 has 2 divisors, whose sum is σ = 766022. Its totient is φ = 766020.

The previous prime is 765991. The next prime is 766039. The reversal of 766021 is 120667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 148225 = 786^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 766021 - 2⁷ = 765893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 765983 and 766001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383010 + 383011.

It is an arithmetic number, because the mean of its divisors is an integer number (383011).

2⁷⁶⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

766021 is a deficient number, since it is larger than the sum of its proper divisors (1).

766021 is an equidigital number, since it uses as much as digits as its factorization.

766021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 766021 is about 875.2262564617. The cubic root of 766021 is about 91.4984123865.

Adding to 766021 its reverse (120667), we get a palindrome (886688).

The spelling of 766021 in words is "seven hundred sixty-six thousand, twenty-one".