1812361920 has 56 divisors (see below), whose sum is σ = 5754252144. Its totient is φ = 483296256.

The previous prime is 1812361907. The next prime is 1812361921. The reversal of 1812361920 is 291632181.

It is not an unprimeable number, because it can be changed into a prime (1812361921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942979 + ... + 944898.

Almost surely, 2^1812361920 is an apocalyptic number.

1812361920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812361920 is an abundant number, since it is smaller than the sum of its proper divisors (3941890224).

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

1812361920 is a wasteful number, since it uses less digits than its factorization.

1812361920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887897 (or 1887887 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1812361920 is about 42571.8442165711. The cubic root of 1812361920 is about 1219.2187778261.

The spelling of 1812361920 in words is "one billion, eight hundred twelve million, three hundred sixty-one thousand, nine hundred twenty".