997530 has 32 divisors (see below), whose sum is σ = 2455488. Its totient is φ = 259200.

The previous prime is 997511. The next prime is 997541. The reversal of 997530 is 35799.

It is a super-2 number, since 2×997530² = 1990132201800, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 997491 and 997500.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 825 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (76734).

2⁹⁹⁷⁵³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227744).

997530 is an abundant number, since it is smaller than the sum of its proper divisors (1457958).

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

997530 is a wasteful number, since it uses less digits than its factorization.

997530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 8505, while the sum is 33.

The square root of 997530 is about 998.7642364442. The cubic root of 997530 is about 99.9175987857.

The spelling of 997530 in words is "nine hundred ninety-seven thousand, five hundred thirty".