640226 has 4 divisors (see below), whose sum is σ = 960342. Its totient is φ = 320112.

The previous prime is 640223. The next prime is 640229. The reversal of 640226 is 622046.

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

It is an interprime number because it is at equal distance from previous prime (640223) and next prime (640229).

It can be written as a sum of positive squares in only one way, i.e., 600625 + 39601 = 775^2 + 199^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640198 and 640207.

It is not an unprimeable number, because it can be changed into a prime (640223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160055 + ... + 160058.

2⁶⁴⁰²²⁶ is an apocalyptic number.

640226 is a deficient number, since it is larger than the sum of its proper divisors (320116).

640226 is a wasteful number, since it uses less digits than its factorization.

640226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320115.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640226 is about 800.1412375325. The cubic root of 640226 is about 86.1875302042.

The spelling of 640226 in words is "six hundred forty thousand, two hundred twenty-six".