226640 has 20 divisors (see below), whose sum is σ = 527124. Its totient is φ = 90624.

The previous prime is 226637. The next prime is 226643. The reversal of 226640 is 46622.

226640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (226637) and next prime (226643).

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 141376 = 292^2 + 376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337 + ... + 1496.

2²²⁶⁶⁴⁰ is an apocalyptic number.

226640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

226640 is an abundant number, since it is smaller than the sum of its proper divisors (300484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

226640 is a wasteful number, since it uses less digits than its factorization.

226640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846 (or 2840 counting only the distinct ones).

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

The square root of 226640 is about 476.0672221441. The cubic root of 226640 is about 60.9694373459.

The spelling of 226640 in words is "two hundred twenty-six thousand, six hundred forty".