1997537 has 4 divisors (see below), whose sum is σ = 2007216. Its totient is φ = 1987860.

The previous prime is 1997531. The next prime is 1997539. The reversal of 1997537 is 7357991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1997537 - 2⁶ = 1997473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997494 and 1997503.

It is not an unprimeable number, because it can be changed into a prime (1997531) 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 3 ways as a sum of consecutive naturals, for example, 4523 + ... + 4944.

It is an arithmetic number, because the mean of its divisors is an integer number (501804).

2^1997537 is an apocalyptic number.

It is an amenable number.

1997537 is a deficient number, since it is larger than the sum of its proper divisors (9679).

1997537 is an equidigital number, since it uses as much as digits as its factorization.

1997537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9678.

The product of its digits is 59535, while the sum is 41.

The square root of 1997537 is about 1413.3424921087. The cubic root of 1997537 is about 125.9403639849.

The spelling of 1997537 in words is "one million, nine hundred ninety-seven thousand, five hundred thirty-seven".