1812169 has 4 divisors (see below), whose sum is σ = 1818900. Its totient is φ = 1805440.

The previous prime is 1812157. The next prime is 1812199. The reversal of 1812169 is 9612181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 262144 = 1245^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812169 - 2⁵ = 1812137 is a prime.

It is a super-2 number, since 2×1812169² = 6567912969122, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812199) 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, 2944 + ... + 3505.

It is an arithmetic number, because the mean of its divisors is an integer number (454725).

2^1812169 is an apocalyptic number.

It is an amenable number.

1812169 is a deficient number, since it is larger than the sum of its proper divisors (6731).

1812169 is an equidigital number, since it uses as much as digits as its factorization.

1812169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730.

The product of its digits is 864, while the sum is 28.

The square root of 1812169 is about 1346.1682658568. The cubic root of 1812169 is about 121.9175515674.

The spelling of 1812169 in words is "one million, eight hundred twelve thousand, one hundred sixty-nine".