997660 has 24 divisors (see below), whose sum is σ = 2123856. Its totient is φ = 393600.

The previous prime is 997651. The next prime is 997663. The reversal of 997660 is 66799.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997663) by changing a digit.

997660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 7 ways as a sum of consecutive naturals, for example, 1360 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (88494).

2⁹⁹⁷⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

997660 is an abundant number, since it is smaller than the sum of its proper divisors (1126196).

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

997660 is a wasteful number, since it uses less digits than its factorization.

997660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 997660 is about 998.8293147480. The cubic root of 997660 is about 99.9219390808.

The spelling of 997660 in words is "nine hundred ninety-seven thousand, six hundred sixty".