997578 has 24 divisors (see below), whose sum is σ = 2181348. Its totient is φ = 329472.

The previous prime is 997573. The next prime is 997583. The reversal of 997578 is 875799.

997578 is a nontrivial binomial coefficient, being equal to C(1413, 2).

It is an interprime number because it is at equal distance from previous prime (997573) and next prime (997583).

It can be written as a sum of positive squares in 2 ways, for example, as 974169 + 23409 = 987^2 + 153^2 .

It is not an unprimeable number, because it can be changed into a prime (997573) 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 11 ways as a sum of consecutive naturals, for example, 2650 + ... + 3002.

2⁹⁹⁷⁵⁷⁸ is an apocalyptic number.

997578 is the 1412-nd triangular number.

997578 is an abundant number, since it is smaller than the sum of its proper divisors (1183770).

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

997578 is a wasteful number, since it uses less digits than its factorization.

997578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 515 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 997578 is about 998.7882658502. The cubic root of 997578 is about 99.9192014001.

The spelling of 997578 in words is "nine hundred ninety-seven thousand, five hundred seventy-eight".