1812129 has 16 divisors (see below), whose sum is σ = 2669760. Its totient is φ = 1084160.

The previous prime is 1812121. The next prime is 1812131. The reversal of 1812129 is 9212181.

It is not a de Polignac number, because 1812129 - 2³ = 1812121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1812099 and 1812108.

It is not an unprimeable number, because it can be changed into a prime (1812121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2629 + ... + 3245.

It is an arithmetic number, because the mean of its divisors is an integer number (166860).

2^1812129 is an apocalyptic number.

It is an amenable number.

1812129 is a deficient number, since it is larger than the sum of its proper divisors (857631).

1812129 is a wasteful number, since it uses less digits than its factorization.

1812129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its digits is 288, while the sum is 24.

The square root of 1812129 is about 1346.1534087911. The cubic root of 1812129 is about 121.9166545322.

The spelling of 1812129 in words is "one million, eight hundred twelve thousand, one hundred twenty-nine".