1997371 has 6 divisors (see below), whose sum is σ = 2054220. Its totient is φ = 1942056.

The previous prime is 1997351. The next prime is 1997407. The reversal of 1997371 is 1737991.

It is not a de Polignac number, because 1997371 - 2⁵ = 1997339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 1997371.

It is not an unprimeable number, because it can be changed into a prime (1997311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 640 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (342370).

2^1997371 is an apocalyptic number.

1997371 is a deficient number, since it is larger than the sum of its proper divisors (56849).

1997371 is an equidigital number, since it uses as much as digits as its factorization.

1997371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1496 counting only the distinct ones).

The product of its digits is 11907, while the sum is 37.

The square root of 1997371 is about 1413.2837648540. The cubic root of 1997371 is about 125.9368752419.

The spelling of 1997371 in words is "one million, nine hundred ninety-seven thousand, three hundred seventy-one".