1812445632 has 224 divisors, whose sum is σ = 5638556160. Its totient is φ = 576854784.

The previous prime is 1812445627. The next prime is 1812445643. The reversal of 1812445632 is 2365442181.

It is a happy number.

1812445632 is a `hidden beast` number, since 1 + 8 + 12 + 4 + 4 + 5 + 632 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3218983 + ... + 3219545.

Almost surely, 2^1812445632 is an apocalyptic number.

1812445632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812445632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2819278080).

1812445632 is an abundant number, since it is smaller than the sum of its proper divisors (3826110528).

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

1812445632 is an frugal number, since it uses more digits than its factorization.

1812445632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 591 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 1812445632 is about 42572.8273902498. The cubic root of 1812445632 is about 1219.2375492186.

The spelling of 1812445632 in words is "one billion, eight hundred twelve million, four hundred forty-five thousand, six hundred thirty-two".