690221 has 8 divisors (see below), whose sum is σ = 795264. Its totient is φ = 586800.

The previous prime is 690187. The next prime is 690233. The reversal of 690221 is 122096.

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

It is a cyclic number.

It is not a de Polignac number, because 690221 - 2¹⁴ = 673837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 690193 and 690202.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690221.

It is not an unprimeable number, because it can be changed into a prime (690271) 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, 731 + ... + 1383.

It is an arithmetic number, because the mean of its divisors is an integer number (99408).

2⁶⁹⁰²²¹ is an apocalyptic number.

It is an amenable number.

690221 is a deficient number, since it is larger than the sum of its proper divisors (105043).

690221 is a wasteful number, since it uses less digits than its factorization.

690221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 690221 is about 830.7954020094. The cubic root of 690221 is about 88.3749924144.

The spelling of 690221 in words is "six hundred ninety thousand, two hundred twenty-one".