690445 has 8 divisors (see below), whose sum is σ = 946944. Its totient is φ = 473424.

The previous prime is 690439. The next prime is 690449. The reversal of 690445 is 544096.

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

It is not a de Polignac number, because 690445 - 2¹¹ = 688397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690449) 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, 9829 + ... + 9898.

It is an arithmetic number, because the mean of its divisors is an integer number (118368).

2⁶⁹⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

690445 is a deficient number, since it is larger than the sum of its proper divisors (256499).

690445 is a wasteful number, since it uses less digits than its factorization.

690445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19739.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 690445 is about 830.9302016415. The cubic root of 690445 is about 88.3845516025.

The spelling of 690445 in words is "six hundred ninety thousand, four hundred forty-five".