790021 has 2 divisors, whose sum is σ = 790022. Its totient is φ = 790020.

The previous prime is 790003. The next prime is 790033. The reversal of 790021 is 120097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 172225 = 786^2 + 415^2 .

It is an emirp because it is prime and its reverse (120097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 790021 - 2¹¹ = 787973 is a prime.

It is equal to p₆₃₂₀₈ and since 790021 and 63208 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (790051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395010 + 395011.

It is an arithmetic number, because the mean of its divisors is an integer number (395011).

2⁷⁹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

790021 is a deficient number, since it is larger than the sum of its proper divisors (1).

790021 is an equidigital number, since it uses as much as digits as its factorization.

790021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 790021 is about 888.8312550760. The cubic root of 790021 is about 92.4441737648. Note that the first 3 decimals are identical.

It can be divided in two parts, 79002 and 1, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 790021 in words is "seven hundred ninety thousand, twenty-one".