897709 has 2 divisors, whose sum is σ = 897710. Its totient is φ = 897708.

The previous prime is 897707. The next prime is 897727. The reversal of 897709 is 907798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896809 + 900 = 947^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 897709 - 2¹ = 897707 is a prime.

Together with 897707, it forms a pair of twin primes.

897709 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448854 + 448855.

It is an arithmetic number, because the mean of its divisors is an integer number (448855).

2⁸⁹⁷⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

897709 is a deficient number, since it is larger than the sum of its proper divisors (1).

897709 is an equidigital number, since it uses as much as digits as its factorization.

897709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 897709 is about 947.4750656350. The cubic root of 897709 is about 96.4669452862.

The spelling of 897709 in words is "eight hundred ninety-seven thousand, seven hundred nine".