997156 has 12 divisors (see below), whose sum is σ = 1765260. Its totient is φ = 492800.

The previous prime is 997153. The next prime is 997163. The reversal of 997156 is 651799.

It can be written as a sum of positive squares in 2 ways, for example, as 341056 + 656100 = 584^2 + 810^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (997151) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1045 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (147105).

2⁹⁹⁷¹⁵⁶ is an apocalyptic number.

It is an amenable number.

997156 is a deficient number, since it is larger than the sum of its proper divisors (768104).

997156 is a wasteful number, since it uses less digits than its factorization.

997156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894 (or 2892 counting only the distinct ones).

The product of its digits is 17010, while the sum is 37.

The square root of 997156 is about 998.5769875177. The cubic root of 997156 is about 99.9051099873.

The spelling of 997156 in words is "nine hundred ninety-seven thousand, one hundred fifty-six".