1687097 has 4 divisors (see below), whose sum is σ = 1786356. Its totient is φ = 1587840.

The previous prime is 1687087. The next prime is 1687111. The reversal of 1687097 is 7907861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7907861 = 13 ⋅608297.

It can be written as a sum of positive squares in 2 ways, for example, as 1577536 + 109561 = 1256^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687097 - 2⁶ = 1687033 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 1687097.

It is not an unprimeable number, because it can be changed into a prime (1687057) 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, 49604 + ... + 49637.

It is an arithmetic number, because the mean of its divisors is an integer number (446589).

2^1687097 is an apocalyptic number.

1687097 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1687097 is a deficient number, since it is larger than the sum of its proper divisors (99259).

1687097 is an equidigital number, since it uses as much as digits as its factorization.

1687097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99258.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1687097 is about 1298.8829816423. The cubic root of 1687097 is about 119.0456007709.

The spelling of 1687097 in words is "one million, six hundred eighty-seven thousand, ninety-seven".