709421 has 2 divisors, whose sum is σ = 709422. Its totient is φ = 709420.

The previous prime is 709417. The next prime is 709433. The reversal of 709421 is 124907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 343396 = 605^2 + 586^2 .

It is an emirp because it is prime and its reverse (124907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 709421 - 2² = 709417 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (709451) 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, 354710 + 354711.

It is an arithmetic number, because the mean of its divisors is an integer number (354711).

2⁷⁰⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

709421 is a deficient number, since it is larger than the sum of its proper divisors (1).

709421 is an equidigital number, since it uses as much as digits as its factorization.

709421 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 23.

The square root of 709421 is about 842.2713339536. The cubic root of 709421 is about 89.1869570773.

The spelling of 709421 in words is "seven hundred nine thousand, four hundred twenty-one".