997428 has 24 divisors (see below), whose sum is σ = 2382688. Its totient is φ = 324576.

The previous prime is 997427. The next prime is 997433. The reversal of 997428 is 824799.

997428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451 + ... + 1482.

2⁹⁹⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

997428 is an abundant number, since it is smaller than the sum of its proper divisors (1385260).

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

997428 is a wasteful number, since it uses less digits than its factorization.

997428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983 (or 1981 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 997428 is about 998.7131720369. The cubic root of 997428 is about 99.9141930594.

The spelling of 997428 in words is "nine hundred ninety-seven thousand, four hundred twenty-eight".