1812120 has 32 divisors (see below), whose sum is σ = 5436720. Its totient is φ = 483200.

The previous prime is 1812103. The next prime is 1812121. The reversal of 1812120 is 212181.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1812120.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7431 + ... + 7670.

2^1812120 is an apocalyptic number.

1812120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812120 is an abundant number, since it is smaller than the sum of its proper divisors (3624600).

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

1812120 is a wasteful number, since it uses less digits than its factorization.

1812120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15115 (or 15111 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1812120 is about 1346.1500659288. The cubic root of 1812120 is about 121.9164526975.

The spelling of 1812120 in words is "one million, eight hundred twelve thousand, one hundred twenty".