1997136 has 100 divisors (see below), whose sum is σ = 6121632. Its totient is φ = 627264.

The previous prime is 1997129. The next prime is 1997137. The reversal of 1997136 is 6317991.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1997136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997137) 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 19 ways as a sum of consecutive naturals, for example, 29775 + ... + 29841.

2^1997136 is an apocalyptic number.

1997136 is a gapful number since it is divisible by the number (16) 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 1997136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3060816).

1997136 is an abundant number, since it is smaller than the sum of its proper divisors (4124496).

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

1997136 is a wasteful number, since it uses less digits than its factorization.

1997136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 95 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 1997136 is about 1413.2006227001. The cubic root of 1997136 is about 125.9319360282.

The spelling of 1997136 in words is "one million, nine hundred ninety-seven thousand, one hundred thirty-six".