1665226 has 4 divisors (see below), whose sum is σ = 2497842. Its totient is φ = 832612.

The previous prime is 1665221. The next prime is 1665233. The reversal of 1665226 is 6225661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6225661 = 13 ⋅478897.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 39601 = 1275^2 + 199^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1665194 and 1665203.

It is not an unprimeable number, because it can be changed into a prime (1665221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416305 + ... + 416308.

2^1665226 is an apocalyptic number.

1665226 is a deficient number, since it is larger than the sum of its proper divisors (832616).

1665226 is an equidigital number, since it uses as much as digits as its factorization.

1665226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832615.

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

The square root of 1665226 is about 1290.4363603061. The cubic root of 1665226 is about 118.5289383176.

It can be divided in two parts, 1665 and 226, that added together give a triangular number (1891 = T₆₁).

The spelling of 1665226 in words is "one million, six hundred sixty-five thousand, two hundred twenty-six".