1693889 has 2 divisors, whose sum is σ = 1693890. Its totient is φ = 1693888.

The previous prime is 1693883. The next prime is 1693891. The reversal of 1693889 is 9883961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 693889 = 1000^2 + 833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1693889 - 2⁸ = 1693633 is a prime.

Together with 1693891, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1693883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 846944 + 846945.

It is an arithmetic number, because the mean of its divisors is an integer number (846945).

2^1693889 is an apocalyptic number.

It is an amenable number.

1693889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1693889 is an equidigital number, since it uses as much as digits as its factorization.

1693889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 1693889 is about 1301.4949097096. The cubic root of 1693889 is about 119.2051401249.

The spelling of 1693889 in words is "one million, six hundred ninety-three thousand, eight hundred eighty-nine".