1806812145 has 12 divisors (see below), whose sum is σ = 3131807796. Its totient is φ = 963633120.

The previous prime is 1806812101. The next prime is 1806812171. The reversal of 1806812145 is 5412186081.

It can be written as a sum of positive squares in 2 ways, for example, as 863830881 + 942981264 = 29391^2 + 30708^2 .

It is not a de Polignac number, because 1806812145 - 2⁷ = 1806812017 is a prime.

It is a Curzon number.

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, 20075646 + ... + 20075735.

It is an arithmetic number, because the mean of its divisors is an integer number (260983983).

Almost surely, 2^1806812145 is an apocalyptic number.

1806812145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1806812145 is a deficient number, since it is larger than the sum of its proper divisors (1324995651).

1806812145 is a wasteful number, since it uses less digits than its factorization.

1806812145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40151392 (or 40151389 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1806812145 is about 42506.6129561037. The cubic root of 1806812145 is about 1217.9730170278.

The spelling of 1806812145 in words is "one billion, eight hundred six million, eight hundred twelve thousand, one hundred forty-five".