1812122040 has 64 divisors (see below), whose sum is σ = 5487212160. Its totient is φ = 478712960.

The previous prime is 1812122029. The next prime is 1812122041. The reversal of 1812122040 is 402212181.

It is a junction number, because it is equal to n+sod(n) for n = 1812121998 and 1812122016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812122041) 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 15 ways as a sum of consecutive naturals, for example, 57726 + ... + 83405.

It is an arithmetic number, because the mean of its divisors is an integer number (85737690).

Almost surely, 2^1812122040 is an apocalyptic number.

1812122040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812122040 is an abundant number, since it is smaller than the sum of its proper divisors (3675090120).

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

1812122040 is a wasteful number, since it uses less digits than its factorization.

1812122040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141252 (or 141248 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1812122040 is about 42569.0267682972. The cubic root of 1812122040 is about 1219.1649844674.

The spelling of 1812122040 in words is "one billion, eight hundred twelve million, one hundred twenty-two thousand, forty".