1806436045 has 4 divisors (see below), whose sum is σ = 2167723260. Its totient is φ = 1445148832.

The previous prime is 1806436019. The next prime is 1806436057. The reversal of 1806436045 is 5406346081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5406346081 = 787 ⋅6869563.

It can be written as a sum of positive squares in 2 ways, for example, as 280830564 + 1525605481 = 16758^2 + 39059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806436045 - 2²³ = 1798047437 is a prime.

It is a super-3 number, since 3×1806436045³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1806435995 and 1806436013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180643600 + ... + 180643609.

It is an arithmetic number, because the mean of its divisors is an integer number (541930815).

Almost surely, 2^1806436045 is an apocalyptic number.

It is an amenable number.

1806436045 is a deficient number, since it is larger than the sum of its proper divisors (361287215).

1806436045 is an equidigital number, since it uses as much as digits as its factorization.

1806436045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361287214.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 1806436045 is about 42502.1887083477. The cubic root of 1806436045 is about 1217.8885014275. Note that the first 3 decimals are identical.

The spelling of 1806436045 in words is "one billion, eight hundred six million, four hundred thirty-six thousand, forty-five".