1809106 has 16 divisors (see below), whose sum is σ = 3095064. Its totient is φ = 785664.

The previous prime is 1809097. The next prime is 1809113. The reversal of 1809106 is 6019081.

It can be written as a sum of positive squares in 4 ways, for example, as 1418481 + 390625 = 1191^2 + 625^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605 + ... + 2488.

2^1809106 is an apocalyptic number.

1809106 is a deficient number, since it is larger than the sum of its proper divisors (1285958).

1809106 is a wasteful number, since it uses less digits than its factorization.

1809106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1809106 is about 1345.0301111871. The cubic root of 1809106 is about 121.8488228679.

Subtracting from 1809106 its sum of digits (25), we obtain a palindrome (1809081).

The spelling of 1809106 in words is "one million, eight hundred nine thousand, one hundred six".