997750 has 32 divisors (see below), whose sum is σ = 2018016. Its totient is φ = 367200.

The previous prime is 997741. The next prime is 997751. The reversal of 997750 is 57799.

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 (997751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3097 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (63063).

2⁹⁹⁷⁷⁵⁰ is an apocalyptic number.

997750 is an abundant number, since it is smaller than the sum of its proper divisors (1020266).

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

997750 is a wasteful number, since it uses less digits than its factorization.

997750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 997750 is about 998.8743664746. The cubic root of 997750 is about 99.9249436796.

The spelling of 997750 in words is "nine hundred ninety-seven thousand, seven hundred fifty".