1688923 has 2 divisors, whose sum is σ = 1688924. Its totient is φ = 1688922.

The previous prime is 1688917. The next prime is 1688927. The reversal of 1688923 is 3298861.

It is a strong prime.

It is an emirp because it is prime and its reverse (3298861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688923 - 2⁹ = 1688411 is a prime.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 8³ + 9 + 2¹³ + 3⁴ .

It is not a weakly prime, because it can be changed into another prime (1688927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844461 + 844462.

It is an arithmetic number, because the mean of its divisors is an integer number (844462).

2^1688923 is an apocalyptic number.

1688923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688923 is an equidigital number, since it uses as much as digits as its factorization.

1688923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 1688923 is about 1299.5857032147. The cubic root of 1688923 is about 119.0885342614.

The spelling of 1688923 in words is "one million, six hundred eighty-eight thousand, nine hundred twenty-three".