1997009 has 4 divisors (see below), whose sum is σ = 2282304. Its totient is φ = 1711716.

The previous prime is 1997003. The next prime is 1997029. The reversal of 1997009 is 9007991.

It is a happy number.

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 1997009 - 2¹⁶ = 1931473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1997009.

It is not an unprimeable number, because it can be changed into a prime (1997003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142637 + ... + 142650.

It is an arithmetic number, because the mean of its divisors is an integer number (570576).

2^1997009 is an apocalyptic number.

It is an amenable number.

1997009 is a deficient number, since it is larger than the sum of its proper divisors (285295).

1997009 is an equidigital number, since it uses as much as digits as its factorization.

1997009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285294.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 1997009 is about 1413.1556885213. The cubic root of 1997009 is about 125.9292665898.

The spelling of 1997009 in words is "one million, nine hundred ninety-seven thousand, nine".