1997217 has 12 divisors (see below), whose sum is σ = 2992080. Its totient is φ = 1331316.

The previous prime is 1997213. The next prime is 1997231. The reversal of 1997217 is 7127991.

It is not a de Polignac number, because 1997217 - 2² = 1997213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1997213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3867 + ... + 4352.

It is an arithmetic number, because the mean of its divisors is an integer number (249340).

2^1997217 is an apocalyptic number.

It is an amenable number.

1997217 is a deficient number, since it is larger than the sum of its proper divisors (994863).

1997217 is an frugal number, since it uses more digits than its factorization.

1997217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8234 (or 8222 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1997217 is about 1413.2292807609. The cubic root of 1997217 is about 125.9336385244.

The spelling of 1997217 in words is "one million, nine hundred ninety-seven thousand, two hundred seventeen".