1643226 has 16 divisors (see below), whose sum is σ = 3539424. Its totient is φ = 505584.

The previous prime is 1643221. The next prime is 1643231. The reversal of 1643226 is 6223461.

It is an interprime number because it is at equal distance from previous prime (1643221) and next prime (1643231).

It is a d-powerful number, because it can be written as 1 + 6 + 4³ + 3¹³ + 2⁷ + 2¹¹ + 6⁶ .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1643196 and 1643205.

It is not an unprimeable number, because it can be changed into a prime (1643221) 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, 10456 + ... + 10611.

It is an arithmetic number, because the mean of its divisors is an integer number (221214).

2^1643226 is an apocalyptic number.

1643226 is an abundant number, since it is smaller than the sum of its proper divisors (1896198).

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

1643226 is a wasteful number, since it uses less digits than its factorization.

1643226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21085.

The product of its digits is 1728, while the sum is 24.

The square root of 1643226 is about 1281.8837700821. The cubic root of 1643226 is about 118.0046440765.

Adding to 1643226 its reverse (6223461), we get a palindrome (7866687).

The spelling of 1643226 in words is "one million, six hundred forty-three thousand, two hundred twenty-six".