1817021412 has 36 divisors (see below), whose sum is σ = 4594540860. Its totient is φ = 605474112.

The previous prime is 1817021399. The next prime is 1817021443. The reversal of 1817021412 is 2141207181.

1817021412 is a `hidden beast` number, since 181 + 70 + 2 + 1 + 412 = 666.

1817021412 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 288524196 + 1528497216 = 16986^2 + 39096^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137278 + ... + 149930.

It is an arithmetic number, because the mean of its divisors is an integer number (127626135).

Almost surely, 2^1817021412 is an apocalyptic number.

1817021412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1817021412 is an abundant number, since it is smaller than the sum of its proper divisors (2777519448).

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

1817021412 is a wasteful number, since it uses less digits than its factorization.

1817021412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16652 (or 16647 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 1817021412 is about 42626.5341307501. The cubic root of 1817021412 is about 1220.2627338832.

Adding to 1817021412 its reverse (2141207181), we get a palindrome (3958228593).

The spelling of 1817021412 in words is "one billion, eight hundred seventeen million, twenty-one thousand, four hundred twelve".