1689901 has 4 divisors (see below), whose sum is σ = 1735612. Its totient is φ = 1644192.

The previous prime is 1689893. The next prime is 1689907. The reversal of 1689901 is 1099861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 139876 = 1245^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689901 - 2³ = 1689893 is a prime.

It is a Duffinian number.

1689901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22800 + ... + 22873.

It is an arithmetic number, because the mean of its divisors is an integer number (433903).

2^1689901 is an apocalyptic number.

It is an amenable number.

1689901 is a deficient number, since it is larger than the sum of its proper divisors (45711).

1689901 is an equidigital number, since it uses as much as digits as its factorization.

1689901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45710.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1689901 is about 1299.9619225193. The cubic root of 1689901 is about 119.1115165826. Note that the first 3 decimals are identical.

The spelling of 1689901 in words is "one million, six hundred eighty-nine thousand, nine hundred one".