1689445 has 8 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 1332240.

The previous prime is 1689437. The next prime is 1689451. The reversal of 1689445 is 5449861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1689445 - 2³ = 1689437 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2025 + ... + 2734.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

2^1689445 is an apocalyptic number.

It is an amenable number.

1689445 is a deficient number, since it is larger than the sum of its proper divisors (366875).

1689445 is an equidigital number, since it uses as much as digits as its factorization.

1689445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its digits is 34560, while the sum is 37.

The square root of 1689445 is about 1299.7865209333. The cubic root of 1689445 is about 119.1008020028.

The spelling of 1689445 in words is "one million, six hundred eighty-nine thousand, four hundred forty-five".