897989 has 4 divisors (see below), whose sum is σ = 937056. Its totient is φ = 858924.

The previous prime is 897983. The next prime is 898013. The reversal of 897989 is 989798.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989798 = 2 ⋅494899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19499 + ... + 19544.

It is an arithmetic number, because the mean of its divisors is an integer number (234264).

2⁸⁹⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

897989 is a deficient number, since it is larger than the sum of its proper divisors (39067).

897989 is a wasteful number, since it uses less digits than its factorization.

897989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39066.

The product of its digits is 326592, while the sum is 50.

The square root of 897989 is about 947.6228152593. The cubic root of 897989 is about 96.4769737538.

Subtracting 897989 from its reverse (989798), we obtain a square (91809 = 303²).

The spelling of 897989 in words is "eight hundred ninety-seven thousand, nine hundred eighty-nine".