897909 has 8 divisors (see below), whose sum is σ = 1203360. Its totient is φ = 595536.

The previous prime is 897907. The next prime is 897931. The reversal of 897909 is 909798.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 897909 - 2¹ = 897907 is a prime.

897909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (150420).

2⁸⁹⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

897909 is a deficient number, since it is larger than the sum of its proper divisors (305451).

897909 is a wasteful number, since it uses less digits than its factorization.

897909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 897909 is about 947.5806034317. The cubic root of 897909 is about 96.4741086901.

The spelling of 897909 in words is "eight hundred ninety-seven thousand, nine hundred nine".