1689621 has 8 divisors (see below), whose sum is σ = 2269824. Its totient is φ = 1117920.

The previous prime is 1689617. The next prime is 1689641. The reversal of 1689621 is 1269861.

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

It is not a de Polignac number, because 1689621 - 2² = 1689617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645 + ... + 2466.

It is an arithmetic number, because the mean of its divisors is an integer number (283728).

2^1689621 is an apocalyptic number.

It is an amenable number.

1689621 is a deficient number, since it is larger than the sum of its proper divisors (580203).

1689621 is a wasteful number, since it uses less digits than its factorization.

1689621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251.

The product of its digits is 5184, while the sum is 33.

The square root of 1689621 is about 1299.8542225957. The cubic root of 1689621 is about 119.1049376831.

The spelling of 1689621 in words is "one million, six hundred eighty-nine thousand, six hundred twenty-one".