1997028 has 72 divisors (see below), whose sum is σ = 5789280. Its totient is φ = 590400.

The previous prime is 1997003. The next prime is 1997029. The reversal of 1997028 is 8207991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1996983 and 1997001.

It is not an unprimeable number, because it can be changed into a prime (1997029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48688 + ... + 48728.

2^1997028 is an apocalyptic number.

1997028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2894640).

1997028 is an abundant number, since it is smaller than the sum of its proper divisors (3792252).

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

1997028 is a wasteful number, since it uses less digits than its factorization.

1997028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1997028 is about 1413.1624110484. The cubic root of 1997028 is about 125.9296659618.

It can be divided in two parts, 199 and 7028, that added together give a palindrome (7227).

The spelling of 1997028 in words is "one million, nine hundred ninety-seven thousand, twenty-eight".