997966 has 8 divisors (see below), whose sum is σ = 1509120. Its totient is φ = 494928.

The previous prime is 997963. The next prime is 997973. The reversal of 997966 is 669799.

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

It is a super-2 number, since 2×997966² = 1991872274312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997961) 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, 1711 + ... + 2218.

It is an arithmetic number, because the mean of its divisors is an integer number (188640).

2⁹⁹⁷⁹⁶⁶ is an apocalyptic number.

997966 is a deficient number, since it is larger than the sum of its proper divisors (511154).

997966 is a wasteful number, since it uses less digits than its factorization.

997966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058.

The product of its digits is 183708, while the sum is 46.

The square root of 997966 is about 998.9824823289. The cubic root of 997966 is about 99.9321539796.

The spelling of 997966 in words is "nine hundred ninety-seven thousand, nine hundred sixty-six".