1688897 has 4 divisors (see below), whose sum is σ = 1930176. Its totient is φ = 1447620.

The previous prime is 1688893. The next prime is 1688903. The reversal of 1688897 is 7988861.

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 1688897 - 2² = 1688893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688893) 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, 120629 + ... + 120642.

It is an arithmetic number, because the mean of its divisors is an integer number (482544).

2^1688897 is an apocalyptic number.

It is an amenable number.

1688897 is a deficient number, since it is larger than the sum of its proper divisors (241279).

1688897 is an equidigital number, since it uses as much as digits as its factorization.

1688897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241278.

The product of its digits is 193536, while the sum is 47.

The square root of 1688897 is about 1299.5756999883. The cubic root of 1688897 is about 119.0879231584.

The spelling of 1688897 in words is "one million, six hundred eighty-eight thousand, eight hundred ninety-seven".