1689407 has 4 divisors (see below), whose sum is σ = 1743936. Its totient is φ = 1634880.

The previous prime is 1689397. The next prime is 1689431. The reversal of 1689407 is 7049861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1689407 - 2⁶ = 1689343 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689437) 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, 27218 + ... + 27279.

It is an arithmetic number, because the mean of its divisors is an integer number (435984).

2^1689407 is an apocalyptic number.

1689407 is a deficient number, since it is larger than the sum of its proper divisors (54529).

1689407 is an equidigital number, since it uses as much as digits as its factorization.

1689407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54528.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1689407 is about 1299.7719030661. The cubic root of 1689407 is about 119.0999090341.

The spelling of 1689407 in words is "one million, six hundred eighty-nine thousand, four hundred seven".