1831997 has 4 divisors (see below), whose sum is σ = 1834716. Its totient is φ = 1829280.

The previous prime is 1831993. The next prime is 1832011. The reversal of 1831997 is 7991381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7991381 = 19 ⋅420599.

It can be written as a sum of positive squares in 2 ways, for example, as 1094116 + 737881 = 1046^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831997 - 2² = 1831993 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 1831997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1831993) 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, 497 + ... + 1977.

It is an arithmetic number, because the mean of its divisors is an integer number (458679).

2^1831997 is an apocalyptic number.

It is an amenable number.

1831997 is a deficient number, since it is larger than the sum of its proper divisors (2719).

1831997 is a wasteful number, since it uses less digits than its factorization.

1831997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718.

The product of its digits is 13608, while the sum is 38.

The square root of 1831997 is about 1353.5128370282. The cubic root of 1831997 is about 122.3605966619.

The spelling of 1831997 in words is "one million, eight hundred thirty-one thousand, nine hundred ninety-seven".