897666 has 64 divisors (see below), whose sum is σ = 2350080. Its totient is φ = 221760.

The previous prime is 897649. The next prime is 897671. The reversal of 897666 is 666798.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

897666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13365 + ... + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (36720).

2⁸⁹⁷⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 897666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175040).

897666 is an abundant number, since it is smaller than the sum of its proper divisors (1452414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

897666 is a wasteful number, since it uses less digits than its factorization.

897666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119.

The product of its digits is 108864, while the sum is 42.

The square root of 897666 is about 947.4523734732. The cubic root of 897666 is about 96.4654050154.

It can be divided in two parts, 8976 and 66, that multiplied together give a triangular number (592416 = T₁₀₈₈).

The spelling of 897666 in words is "eight hundred ninety-seven thousand, six hundred sixty-six".