1997736 has 64 divisors (see below), whose sum is σ = 5678400. Its totient is φ = 580608.

The previous prime is 1997731. The next prime is 1997747. The reversal of 1997736 is 6377991.

It is an Ulam number.

Its product of digits (71442) is a multiple of the sum of its prime factors (378).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5760 + ... + 6096.

It is an arithmetic number, because the mean of its divisors is an integer number (88725).

2^1997736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2839200).

1997736 is an abundant number, since it is smaller than the sum of its proper divisors (3680664).

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

1997736 is a wasteful number, since it uses less digits than its factorization.

1997736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 374 counting only the distinct ones).

The product of its digits is 71442, while the sum is 42.

The square root of 1997736 is about 1413.4128908426. The cubic root of 1997736 is about 125.9445460184.

The spelling of 1997736 in words is "one million, nine hundred ninety-seven thousand, seven hundred thirty-six".