1812156 has 12 divisors (see below), whose sum is σ = 4228392. Its totient is φ = 604048.

The previous prime is 1812137. The next prime is 1812157. The reversal of 1812156 is 6512181.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75495 + ... + 75518.

It is an arithmetic number, because the mean of its divisors is an integer number (352366).

2^1812156 is an apocalyptic number.

It is an amenable number.

1812156 is an abundant number, since it is smaller than the sum of its proper divisors (2416236).

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

1812156 is a wasteful number, since it uses less digits than its factorization.

1812156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151020 (or 151018 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 1812156 is about 1346.1634373285. The cubic root of 1812156 is about 121.9172600324.

The spelling of 1812156 in words is "one million, eight hundred twelve thousand, one hundred fifty-six".