1997541 has 40 divisors (see below), whose sum is σ = 3686144. Its totient is φ = 1049760.

The previous prime is 1997539. The next prime is 1997543. The reversal of 1997541 is 1457991.

It is an interprime number because it is at equal distance from previous prime (1997539) and next prime (1997543).

It is not a de Polignac number, because 1997541 - 2¹ = 1997539 is a prime.

It is a Curzon number.

1997541 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1997496 and 1997505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997543) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7236 + ... + 7506.

2^1997541 is an apocalyptic number.

It is an amenable number.

1997541 is a deficient number, since it is larger than the sum of its proper divisors (1688603).

1997541 is a wasteful number, since it uses less digits than its factorization.

1997541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 294 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 1997541 is about 1413.3439071932. The cubic root of 1997541 is about 125.9404480486.

The spelling of 1997541 in words is "one million, nine hundred ninety-seven thousand, five hundred forty-one".