764021 has 2 divisors, whose sum is σ = 764022. Its totient is φ = 764020.

The previous prime is 764017. The next prime is 764041. The reversal of 764021 is 120467.

It is an a-pointer prime, because the next prime (764041) can be obtained adding 764021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 184900 = 761^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 764021 - 2² = 764017 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 763984 and 764002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382010 + 382011.

It is an arithmetic number, because the mean of its divisors is an integer number (382011).

2⁷⁶⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

764021 is a deficient number, since it is larger than the sum of its proper divisors (1).

764021 is an equidigital number, since it uses as much as digits as its factorization.

764021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 764021 is about 874.0829480089. The cubic root of 764021 is about 91.4187120832.

Adding to 764021 its reverse (120467), we get a palindrome (884488).

The spelling of 764021 in words is "seven hundred sixty-four thousand, twenty-one".