997604 has 12 divisors (see below), whose sum is σ = 1752828. Its totient is φ = 496800.

The previous prime is 997597. The next prime is 997609. The reversal of 997604 is 406799.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 640000 = 598^2 + 800^2 .

It is not an unprimeable number, because it can be changed into a prime (997609) by changing a digit.

997604 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 3 ways as a sum of consecutive naturals, for example, 1574 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (146069).

2⁹⁹⁷⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

997604 is a deficient number, since it is larger than the sum of its proper divisors (755224).

997604 is a wasteful number, since it uses less digits than its factorization.

997604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 997604 is about 998.8012815370. The cubic root of 997604 is about 99.9200694614.

The spelling of 997604 in words is "nine hundred ninety-seven thousand, six hundred four".